How to determine the engine size of a four-stroke Chinese scooter

More detailed diagnostics

To avoid problems with the moped and be completely confident in the serviceability of the scooter, you need to conduct a more complete check. One of the main characteristics of a working scooter motor is normal compression. More on this indicator of the condition of the piston group later.

Scooter compression check

• Unscrew the spark plug (at the same time assess its condition)
• Screw the compression gauge tightly into the spark plug hole
• We press the kickstarter lever several times, thereby creating pressure in the piston

Attention! During diagnostics, you should not try to start the scooter engine using an electric starter.

We look at the compression meter readings

• Ideally, the compression value should be 10 units
• The normal indicator for a used scooter is 7 ... 9
• The numbers below are unacceptable - the engine must be immediately put in for service: replacement of piston rings, piston or CPG. If this is not done, then there is a high probability of failure of the power unit, and its replacement is quite expensive and can reach half the cost of the scooter

It is worth noting that any other methods of checking the compression of a scooter engine do not pretend to be the slightest objectivity and are often used by dishonest vehicle sellers in order to mislead the gullible buyer.

Of course, in this publication we did not reveal all the methods for diagnosing the condition of the motor when choosing and buying a used scooter, but knowing the basics will help you avoid a completely unsuccessful purchase. If in any doubt, contact a moped repair specialist. Enjoy the shopping!

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When is it necessary to change the piston on a scooter?

The piston on a scooter requires a complete replacement only as a last resort. There is no need to try to update the piston group as soon as the first problems begin in the operation of the motor vehicle. Sluggish acceleration, failure to start the first time, deterioration in dynamics are not a reason to completely disassemble the piston on the scooter or replace it. This procedure (especially if carried out together with a cylinder) is quite complicated and costs a lot of money, which could be spent on something more useful.

In total, there are two main reasons that require a complete replacement of the piston on a scooter. The first is mechanical wear, when the piston on a scooter has already used its entire lifespan; the second is the same, but this time regarding the cylinder. In this case, poor compression will be observed, which can be easily diagnosed with a compressor. If the value is below 7, you can already think about replacing the piston on the scooter. If the value exceeds this mark, then this repair option will have to be put aside for now (until worse times).

If the mechanism does not have a compressor in its arsenal, you can use the following option. It is considered optimal for diagnostics if the scooter becomes difficult to start, and all arguments lean in favor of replacing the piston group. A little engine oil should be poured into the spark plug hole, and if after this manipulation the scooter begins to obey better and starts the first time, then the problem is that the compression is deteriorating. But, I draw your attention to the fact that this performance indicator may have absolutely nothing to do with the piston on the scooter. Everything can be much simpler, for example, a gasket has broken or the surface of the head has become bent. You should not immediately throw away money on replacing the piston if it is possible, by eliminating minor errors, to achieve optimal performance of the motor vehicle.

You can check cylinder wear in another fairly simple way. To do this, you need to measure the gap between the two ends of the upper (compression) piston ring inserted into the cylinder. If this value exceeds 0.5 mm, then cylinder repair is definitely required.

After carrying out all the above manipulations, it turned out that the problem was in this unit, and the piston on the scooter along with the cylinder was quite worn out. What to do next?

There are two ways to go. The first is to buy a prefabricated CPG and not bother with finding a qualified turner, since the replacement is quite easy to do yourself. The main thing is to buy the right piston for the scooter that suits the specific model of the vehicle. And to do this, you don’t need to go to the first motorcycle parts seller you come across and rejoice at the cheapness of the range presented there. The piston on a scooter is a key component of the entire system, so if you install the wrong option, you may not get anywhere at all.

The second option is suitable for those who own a high-quality “Japanese” and do not want to equip their pet with dubious spare parts. Then it would be best to bore the old cylinder, but doing this without experience is almost impossible. In this case, only a piston is purchased for the scooter, and the cylinder is simply adjusted to its size.

The turner will determine by what repair size it is possible to bore the original cylinder. There are only four of these values ​​(0.25; 0.5; 0.75 and 1). They are measured in millimeters and indicate how much can be removed from the cylinder and added to the piston. But it's not that simple. Be sure to take into account parameters such as piston expansion as heat increases. This correction must be at least 0.10 mm, otherwise the likelihood of jamming will increase many times over. In this case, the piston on the scooter will not affect the compression level in any way.

The specialist determines the size of the required bore and indicates the size of the piston that needs to be purchased. Next, the procedure of boring the cylinder for the purchased piston is carried out, and it is better that it is carried out by the same turner who has previously become familiar with the engine components of the piston group.

After the replacement, the piston on the scooter, together with the new or bored cylinder, must be run in. This part of the procedure should not be neglected, since the further performance of the motor vehicle will depend on it.

Scooters by engine type

1. Engine capacity up to 50cm3. Such scooters are easy to operate because... The maximum speed usually does not exceed 50 km/h. The problem of low power can be solved by boosting the engine, but this is not an easy task and is dangerous for the engine. It’s easier to “pump up” popular scooter models: there are step-by-step recommendations on the Internet and books, as well as repair kits for improving the characteristics of the unit. But the acceleration speed of the scooter does not improve even after boosting the engine.

1. Engine capacity 51-125 cm3. These are classic city scooters, with great maneuverability and an affordable price. Such mopeds are very popular in Russia.
2. Engine capacity 126-250 cm3. These are sports scooters that will appeal to speed fans. They have excellent driving performance, are easy to maintain and durable in use.
3. Engine capacity over 251 m3. Maxi-scooters that can even compete with motorcycles. These scooters are of interest to fans of racing vehicles. Maxi scooters demonstrate excellent handling, stability on the road and rapid acceleration to the required speed in seconds.

Advertising: on the website https://topdetal.ru/ you will always find a large list of auto components

Two-stroke or four-stroke engine?

Like any other vehicle, the level of a scooter is determined by the power of its engine. If the scooter engine is able to withstand significant loads and is also easy to maintain, then such a scooter can be forgiven for minor shortcomings, such as appearance, etc. A two-stroke air-cooled engine is more convenient and economical. It can be modernized, improved, and at the same time filled with fuel of not the highest quality.

But in Japan and Europe, two-stroke engines were replaced by four-stroke liquid-cooled engines - more environmentally friendly and sophisticated. Now they leave the bulk of the market to new environmental regulations. Scooters with a two-stroke engine are still on sale, so if you buy such a scooter, even second-hand, you won’t regret it; the purchase will be completely worth it.

Which fuel system is better?

Quite often they indicate “direct injection” and “carburetor”. The carburetor is more suitable for Russian conditions. Engines that are equipped with such a fuel system react quite nobly to poor quality gasoline, are easy to repair, but unfortunately are less reliable. The “direct injection” system is more economical and reduces harmful emissions into the environment. But their design is quite complex, which affects the price of the scooter. In addition, you will have to constantly monitor the condition of the engine and respond to any malfunction in its operation. Most modern scooters on sale today operate on a “direct injection” system.

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How to distinguish a 166FMM motor from a 172FMM

And now let's move on to the most important question, so how to distinguish the 166FMM engine and its brothers from the more powerful 172FMM engine? We discard the disassembly of the engine immediately)))

If you want to buy a motorcycle with a real ZS172FMM-3A engine, please contact our store
Motolifeshop.ru , we will be happy to help you.
Still have questions?
I will be happy to answer them in personal messages on VK vk.com/evgeniy.naboka or by mail

Decoding the engine number of a Chinese scooter

Let's look at the decoding of the engine number in more detail. As a rule, the engine number begins with an abbreviation of letters that tell about the plant where it was manufactured.

• RFB - Kymco
• RF4 - Chyong Horng Enterprise Co., LTD.
• LZS – Chongqing Zongshen Group
• LSR - Chongquing Hi-Bird Motorcycle Industry Co., LTD.
• LLC - Chongqing Kinlon S&T Group Co., Ltd.
• LL8 – Jiangsu Linhai Power Machinery Group – Linhai – Model Year 2006 or newer
• LHJ - Chongqing Astronautical Bashan Motorcycle Manufacture Co., LTD.
• LCE - Chunfeng Holding Group Co., LTD. – CFMOTO – Model Year 2003 and newer
• LB2 - Geely
• LAW – Power Sports Factory – Agent For – Qianjiang – Model Year 2003 and Newer
• LAN - Changzhou Yamasaki Motorcycle Co., LTD.
• LAE - China Qingqi Group, Inc.
• RFG - Sanyang Industry Co. LTD.
• LAA - Jialing
• L5X - Cixi Konced Motorcycle Co., LTD.
• L4Y – Qingqi Group Ningbo Rhon
• 5RY - Roketa
• RFB - STR Motorsports, Inc. dba Kymco USA
• LYD - Taizhou City Kaitong Motorcycle
• LJ4 - Shanghai Jmstar Motorcycle Co.
• LFG - Taizhou Chuanl Motorcycle Manufacturing Co., LTD.
• L8Y - Shanghai Shenke Motorcycle Co., LTD
• L5Y - Taizhou Zhongneng Import and Export Co., LTD.
• LFE - Wuxi Futong Motorcycles Co LTD
• LFF - Zhejiang Taizhou Wangye Power Co., LTD.
• L8X - Zhejiang Summit Huawin Motorcycle Co., LTD.
• L4S - Zhejiang Xingyue Vehicle Co., LTD.
• L1E - Zhejiang Lingyun Motorcycle Co., LTD.

It is noteworthy that the absence of an abbreviation may indicate the clandestine origin of the engine. The same thing happens if the scooter manufacturer ordered an engine from a “non-name” company.

This is followed by the number 1 or 2. This is an indicator of the number of cylinders. Usually cylinder 1, but for some reason this is always indicated. To make it easier to perceive information about the engine number, let’s take an arbitrary number as an example:

The first two letters LAA are visible, now we know what manufacturer of the scooter it is. Next comes the number 1, this is the number of cylinders.

The next letter P will tell you about the location of the engine. It can be horizontal or vertical. The horizontal model contains the letters P in the number; the vertical engine does not have this letter.

The next number is 39. This is the diameter of the cylinder. In this case, it says that the engine is fifty dollars, but often the manufacturer lies by installing a larger cylinder, thereby increasing the volume. Although he sells the scooter for fifty dollars and is not even shy. This step is forced, because the four-stroke Chinese fifty-kopeck car doesn’t want to go at all. It is much easier to increase engine capacity than to play tricks with other elements.

Next we see the letter F; the letter Q may appear instead. Most Chinese scooters are equipped with air-cooled engines. Moreover, this cooling can be either natural or forced. A striking example of natural air cooling are mopeds such as Delta, Alpha, Activ and the like. Forced air cooling can be found on scooters where air is sucked in from the side using a cooling impeller.

In our case, after the letter F we see the letter M. It indicates a motorcycle type of engine.

Next is the letter A. But there may be another one, more on that. Chinese scooter engines can range from 50 to 250 cubic centimeters. There are several degrees from minimum to maximum volume, and each level is indicated by the factory with a special letter. More details in the table:

• A, B - up to 50 cm3
• G – up to 100 cm3;
• N – from 100 to 125 cm3
• I – 120 – 125 cm3
• J – 150 cm3
• L – up to 200 cm3
• M – up to 250 cm3

As mentioned above, often the designation does not correspond to the actual volume, but deviations usually occur with scooters with a minimum cubic capacity.

Next we see the number 09. This is the year of manufacture, these two numbers. Now we know that our scooter is a 2009 model.

But the next 6 digits, in our case it is 013 521, are the engine number. For example, our model is 13521 in production order.

As you can see, the engine number of a scooter says a lot. Everyone should know this information about their iron horse.

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Other answers in this thread

Piston killer and road mastodon

#4 Dan4ik

Here's how to decipher the UNIQUE NUMBER code. To broaden your horizons, remember the interpretation of the identification number of any motorcycle, the so-called VIN number (Vehicle Identification Number), using the example - JH2PF010021003231. The first three characters of the VIN number make up the WMI code (World Manufacturers Identification): J – country of manufacture (Japan), H – motorcycle manufacturer (Honda), 2 – manufacturer’s division. Next are six characters of the VDS code (Vehicle Description Section - vehicle descriptive code), the logic of which is determined by the manufacturer himself: PF0100. And the VIN number is completed by a sequence of eight characters of the VIS code (Vehicle Identification Section - vehicle identification code), the first digit of which shows the year of manufacture, the second - the assembly plant, and the last six characters - the serial number of the model: 21003231.

lemniscata (5.5.2008, 18:24) wrote:

#13 Stasmor

STEPAN (20.5.2008, 15:00) wrote:

You laugh, and I was recently driving along the Odessa highway in a canned car, and I looked out the glass, and a young, thin, pretty girl in a GOLD was passing us at an exorbitant speed. The numbers are not ours.

If she drops it at a traffic light, only 2 people will pick it up.

#15 Broni

Dan4ik (15.4.2008, 11:49) wrote:

Here's how to decipher the code

UNIQUE NUMBER To broaden your horizons, remember the interpretation of the identification number of any motorcycle, the so-called VIN number (Vehicle Identification Number), using the example - JH2PF010021003231. The first three characters of the VIN number make up the WMI code (World Manufacturers Identification): J – country of manufacture (Japan), H – motorcycle manufacturer (Honda), 2 – manufacturer’s division. Next come six characters of the VDS code (Vehicle Description Section - vehicle descriptive code), the logic of which is determined by the manufacturer himself: PF0100. And the VIN number is completed by a sequence of eight characters of the VIS code (Vehicle Identification Section - vehicle identification code), the first digit of which shows the year of manufacture, the second - the assembly plant, and the last six characters - the serial number of the model: 21003231.

Grease 4 t and 2 t

Two-stroke and four-stroke engines have engine lubrication systems that differ in design and operating principle. In 2-stroke scooters, it is carried out by mixing motor oil with fuel in prescribed proportions (usually 1:25 ... 1:50). The fuel-air-oil mixture, circulating in the crank and piston chambers, lubricates the connecting rod and crankshaft bearings, as well as the cylinder bore. When the fuel mixture ignites, the oil burns together with gasoline. Its combustion products are removed along with exhaust gases.

There are 2 methods of mixing oil with gasoline. Normal mixing before pouring fuel into the tank and a separate feed, in which the fuel-oil mixture is formed in the inlet pipe located between the carburetor and the cylinder.

Separate lubrication system for two-stroke engine

1. oil tank
2. carburetor
3. throttle cable separator
4. throttle handle
5. oil control cable
6. plunger dosing pump
7. hose supplying oil to the inlet pipe

All modern 2T scooters use a separate oil supply (we fill 2T oil separately from gasoline). In a two-stroke scooter, the engine has an oil tank, the pipeline of which is connected to an oil pump that supplies oil to the inlet pipe in the amount required depending on the amount of air-gasoline mixture. The productivity of the pump depends on the position of the throttle handle. The more fuel is supplied, the more oil is supplied, and vice versa. A separate lubrication system for two-stroke engines is considered more flawless. With it, the ratio of oil to gasoline under light loads can reach 1:200, which leads to a reduction in smoke, reduced soot formation and oil consumption. This design is used on modern scooters with two-stroke engines.

In a four-stroke engine, oil is not mixed with fuel, but is supplied separately. For this purpose, the engines are equipped with a traditional lubrication system consisting of an oil pump, filter, valves, and pipelines. The role of the oil tank can be performed by the engine crankcase (wet sump lubrication system) or a separate tank (dry sump system).

Wet and dry sump four-stroke engine lubrication system

1. oil pan
2. oil intake
3. oil pump
4. oil filter
5. safety valve

When lubrication with a “wet” sump, pump 3 absorbs oil from the sump, pumps it into the outlet cavity and then delivers it through the channels to the crankshaft bearings, crankshaft and timing gear parts. When using dry sump lubrication, oil is poured into a tank, from where it is pumped to the rubbing surfaces. That part of the oil that flows into the crankcase is pumped out by an auxiliary pump, which returns it back to the tank. There is a filter to clean the oil from wear products of engine parts. If necessary, a cooling radiator is also installed, since during operation the oil temperature can rise to high temperatures.

Our popular engines

CB250 169FMM (165FMM, 166FMM) ZONGSHEN

We all know the engine called CB250 from Zongshen, branded as 169FMM (230cc) and its twin brothers 165FMM (223cc) and 166FMM (225cc). These engines have their roots in Honda's MD33 and feature an overhead camshaft, two valves and air cooling. The declared power for all is around 16-17 hp. Installed, as a rule, on entry-level sports cross/enduro, such as ZUUM PX220, Motoland XR250 cross and WRX250, Kayo T2 and K1, BSE J1 and others

CG250-B 167FMM

There is another very popular and similar in characteristics, but not in design, lower engine with a balancing shaft, which is designated as 167FMM. It has a similar power of 16 hp. This engine is installed on inexpensive road models, as well as on dual-purpose enduro motorcycles, such as Motoland XR250 Enduro and Enduro 250 LT, Racer Panther 250 and previously on Irbis TTR250 Enduro

CB250-F 172FMM ZONGSHEN

Nowadays, the Zongshen engine, beloved by many, is the 172FMM, with a displacement of 249 cm3 and a power of 21 hp. It is nothing more than a fairly seriously modernized CB250 169FMM. In addition to the displacement, there were quite a few changes, thanks to which it was possible to achieve an increase in power of around 30%, which is quite cool considering that the volume only increased by 10%. But this engine also has a drawback - vibration, like on a vibration stand. The 172nd engine with a balancing shaft should appear soon, but in the first half of 2020 there is no such thing in Russia yet. Installed by most manufacturers on sports cross/enduro motorcycles in the average price category for China, for example ZUUM CR250CB, Motoland TT250 and XT250HS, GR7 and GR8

NT300 170FMN YINXING

In our country, I have only seen such an engine on Racer motorcycles. Its working volume is 270 cubic meters and its power is about 20 hp. This is a direct competitor to the 172 engine, but has a little more torque and no vibration, thanks to the balancing shaft.

CB250 170MM-2 ZONGSHEN

Another engine called CB250, but labeled 170MM-2. Created on the same base as 172FMM. It has a volume of 249 cm3, a four-valve head, liquid cooling and a power of about 25 hp. Vibrates just like his little brother. At one time, this not the most common engine was installed on the Kayo T5 and is still installed on the Motoland XR250 Pro and WRX250 Lite WFA

CBS300 174MN-3 ZONGSHEN

And this is a modification of 170mm-2, only with a volume of 279.5cc and a power of 25 hp. It also has 4 valves and liquid cooling. In addition, one significant drawback of the engine, vibration, was eliminated by installing a balancing shaft. The engine has recently appeared on our market, but I’m sure it will find its client. In terms of power, it is not far behind the 177MM, but at the same time noticeably cheaper. Low end traction is even better. But its road origin and, accordingly, the kick starter and gearbox foot located not in the best way for enduro are its main drawback. Installed on enduro motorcycles ZUUM CR300CBs, Racer X2, BSE J7

NC250 177MM and NC300 184MN ZONGSHEN

The most popular, and before the appearance of the 450 on the market, also the most powerful Chinese engine with dropsy, is of course the ZS177MM, with a volume of 250 cm3. The engine is equipped with a four-valve cylinder head and liquid cooling, producing 28 hp. Nowadays, the version of this engine with a bigbor is extremely popular, increasing the volume to 297 cm3 and power to 31 hp. According to the labeling rules, it could be called 184MN, but this is essentially a tuning, albeit sometimes a factory one. Installed on a huge number of motorcycles, ZUUM CR300 NC and CX300 NC, Avantis 300 Pro, Motoland XT300 ST, BSE and others.

NC450 194MQ ZONGSHEN

At the moment, this is the top Chinese engine in terms of volume and power from Zongshen. It has water cooling, 4 valves, a volume of 449 cm3 and a power of as much as 38 hp. Present in the lineup of most manufacturers.

Which engine is more powerful: 2 stroke or 4 stroke?

Unlike a 4 ton engine, in which one power stroke occurs per two revolutions of the crankshaft, in a 2 ton engine, a power stroke occurs with each revolution of the crankshaft. This means that a two-stroke engine must have (in theory) twice the liter power (ratio of power to engine displacement) than a four-stroke engine. But in practice the predominance is only 1.5 - 1.8 times. This happens due to inadequate use of the piston stroke during expansion, a worse mechanism for ridding the cylinder of exhaust gases, the consumption of a share of power for purging and other phenomena associated with the distinctive features of gas exchange in 2-stroke engines.

Repair or purchase of a new piston?

Remove the cylinder from the engine and inspect it. There may be carbon deposits inside the piston rings, which can cause working gases to escape. As a result of the appearance of carbon deposits, pressure is lost, so the speed is gained worse and the power of the device decreases. If this is really the case, all you need to do is change the compression rings: to do this, the piston is removed from the connecting rod, the old rings are pulled out and inserted at a level of 2 cm from the top of the cylinder. A play between the connecting rod and the rings of more than 1 mm indicates the need to purchase new compression rings.

Before purchasing a new piston, you should perform the following diagnostics: remove the compression rings and lift the piston until it hits the gap, then swing it in different directions. If there is knocking, you need to order and install a new piston. Such simple manipulations will help you choose the right strategy for purchasing individual parts or a whole group of spare parts.

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How to determine if an engine is 2-stroke or 4-stroke?

The easiest way to determine whether your small engine is a 2-stroke or a 4-stroke is to determine the number and type of fill holes (where you add oil or gasoline) in the engine. Compare the fuel cap and/or oil hole to the image below.

If the engine has one hole for filling oil and gasoline, you have a 2-stroke engine.

If the engine has two filler holes - one for gasoline and the other for filling oil, this means that you have a 4-stroke engine. DO NOT mix oil and gasoline in these engines.

A 4-stroke engine with this sign (fill only with gasoline)

2 Good answer

Is it possible to use 4-stroke engine oil when diluting gasoline?

I pour four-stroke oil into the trimmer, outboard motor and Honda Dio scooter, the flight is normal, there is no smoke, the piston is clean. There are a lot of different oil residues, the bodyaz is all in a heap. Proportion 1:40. In terms of engine sound and smoke quality, it’s still better to pour any mineral 2t-4t, it doesn’t matter, synthetics don’t burn out well, the muffler becomes overgrown with coke

3 Good answer

Which 4-stroke outboard motors can be transported on their sides?

It's a delusion. All four-stroke outboard motors can be transported on their side, but not in any way you like! There is a drawing on the motor housing indicating which side it can be installed on. If there is no picture, look for instructions in the instructions.

4 Good answer

What kind of oil to pour into a scooter gearbox?

Any automotive gear oil with a viscosity of SAE 80W80 is suitable for the gearbox; 85W85 or 75W75 and with quality index according to API GL-4, GL-5.

8 Good answer

Why is it recommended to keep a turbocharged engine idling before turning it off?

To allow the turbines to cool, reduce their rotation speed and stabilize the oil flow. The fact is that the turbocharger impeller rotates at a very high frequency. It happens more than 100 thousand rpm. The bearings on some turbine models (not all) are bushings into which engine oil is supplied under pressure, and the shaft rotates on a thin film (the so-called hydrodynamic bearings - I’m greatly simplifying, but the essence is clear). So, if you suddenly stop the engine after operating at high speeds/load, the turbine will continue to operate for some time by inertia, without cooling and without lubrication, the shaft will begin to slide not on the same oil film, but directly on metal or ceramics. Naturally, friction and wear will be increased.

In general, the maximum wear on the engine is in the first 20 seconds of operation and immediately after you turn off the ignition.

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How to understand that the piston is faulty and requires repair or replacement?

The piston on a scooter wears out naturally in case of intensive use of the moped, as well as insufficient care. What are the consequences of wear and tear for equipment and the owner:

• the efficiency of the motor decreases;
• cravings sharply worsen performance;
• speed increases more slowly;
• fuel is consumed uneconomically.

If you observe at least one of the listed signs, you may suspect problems in the cylinder-piston group. If you decide to diagnose the CPG on a scooter, focus on the following nuances:

1. How does a scooter idle? Unstable?
2. Is there a knocking noise in the engine or cylinder? What about other extraneous noises?
3. Are the piston rings ringing?
4. Is it difficult to start the engine the first time?
5. Is the exhaust pipe producing gray smoke that is intense and thick?
6. When you press the kick starter, do you feel any compression resistance?

If you answered “yes” to the above questions, this is a warning sign. Most likely, the CPG on the scooter will have to be changed.

Engine markings for Chinese scooters! Let's sort it out piece by piece.

Each motor of “rice” scooters has its own marking, which encodes the features of a particular unit. During scheduled scooter repairs (or unscheduled ones), many owners encounter some difficulties in finding spare parts, because they search for the main parts by the model name and not the engine marking. To do this, I recommend that you carefully examine the scooter’s engine, and after washing it of oil and dirt, find engraved numbers and Latin letters there. Most often, the location of these inscriptions is in two places:

• on the crankcase, underneath the cover, in the area of ​​the front variator
• engraving in the gearbox area, also located on the engine crankcase.

Quite often I see how on forums and thematic groups on social networks, fans of the Chinese motorcycle industry argue that, for example, 152QMI and 157QMJ are different engines in principle. Let's figure out what all these numbers and letters mean. The first digit “1” (139QMB) in the marking will indicate that the engine has 1 cylinder. If you suddenly see the number “2” - go nuts, the scooter’s engine is two-cylinder. The letter “P” (1P39QMB) indicates that the cylinder is in a horizontal position. If the letter “P” is missing, then the cylinder on the scooter is not necessarily horizontal. So 139QMB and 1P39QMB, whatever one may say, are the same engines. The next two digits in the designation are “39”, “52”, etc. (152QMI) denote the internal diameter of the cylinder liner, and accordingly the diameter of the piston and rings in the piston group. The first letter speaks about the scooter’s cooling system: “F” (139FMB, 1P39FMB) - air cooling of the motor occurs by free flow;

“Q” (139QMB, 152QMI, 157QMJ) - forced air cooling, there is a blower casing on the cylinder. If the letter is missing, the engine is most likely water-cooled (172MM - CH250). The second letter is the engine type: “M” (139QMA, 139FMA) - motorcycle engine. The third letter in the marking corresponds to the working volume of the cylinder-piston group of the scooter: “A” - up to 50 cubic meters (139QMA) - “honest” fifty dollars); “B” - up to 70 cubic meters (139QMB) - the most common, “almost honest” half-shock, which according to the rules should be labeled as 147QMB or even 150QMB;

"G" - up to 100 cubes; “H” - from 100 to 125 cubes (a rare variety of the GY6 family);

“I” - from 120 to 130 cubic meters (152OMI);

“J” - from 150 to 155 cubic meters (157QMJ);

“M” - up to 250 cc (172MM) - Chinese dropsy clone of Honda Spacy / Freeway with CH 250 engine.

Source

How to find out the engine type on a scooter

Chinese scooter engine (review and labeling)

Many of the owners of Chinese scooters sooner or later face engine repairs. And here the problem arises in finding spare parts; many try to find spare parts for the name of the scooter, which is printed on the scooter itself as stickers. Here lies the surprise itself: in most cases, it is almost impossible to find spare parts for a Chinese scooter by model name. This is due to the fact that Chinese manufacturers are rarely tied to one name for scooters; every year manufacturers can visually release the same model under different names.

How to find spare parts and what engines are installed on scooters, you will learn in this article. As you already correctly understood, look for spare parts

It’s useless, you need to start from the engine markings. There are not many varieties of Chinese engines. The Chinese do not strive to develop new engine models; they even exclude the modification and modernization of the engine itself. Simply put, Chinese manufacturers are content with models that have already been invented for them, namely Japanese engines that have been discontinued. Those. the engine installed on your Chinese scooter was produced 15-20 years ago on Japanese scooters Honda, Suzuki, Yamaha. You can also find copies of engines from European manufacturers of the 90s on Chinese scooters, but such modifications are very rare. Therefore, in this article we will talk only about the most common models and will try to briefly and clearly talk about the markings of Chinese engines.

How to determine the engine size of a four-stroke Chinese scooter

Very often, scooter manufacturers from China hide the engine volume of their scooters for the reason that this volume itself does not correspond to the required 49.9 cubic cm. Sometimes, even the cubic capacity is noted as 50cc, so you can essentially drive an 80-150 cc scooter and don't even know about it. A more or less experienced scooter rider will immediately determine that he has a larger engine under his seat, but it is impossible to say exactly what this volume is just by ear or eye. This all applies to four-stroke Chinese scooters and that is what we will talk about today. With Japanese scooters everything is clear and simple; even if you know the engine number, you can determine the cubic capacity of the scooter, and there will be no trick here, since Japanese manufacturers, like European ones, indicate the engine capacity exactly to the tenth of a cubic meter. To determine the piston volume of your Chinese scooter, all you need is a caliper. Naturally, these readings will be approximate, since not all engines have the same piston stroke, hence the diameter for the same volumes may differ slightly. But for the most part, most Chinese scooters are equipped with precisely these pistons, the diameter of which is indicated in the table.

Very often, scooter manufacturers from China hide the engine volume of their scooters for the reason that this volume itself does not correspond to the required 49.9 cubic cm. Sometimes, even the cubic capacity is noted as 50cc, so you can essentially drive an 80-150 cc scooter and don't even know about it.

A more or less experienced scooter rider will immediately determine that he has a larger engine under his seat, but it is impossible to say exactly what this volume is just by ear or eye.

This all applies to four-stroke Chinese scooters and that is what we will talk about today. With Japanese scooters everything is clear and simple; even if you know the engine number, you can determine the cubic capacity of the scooter, and there will be no trick here, since Japanese manufacturers, like European ones, indicate the engine capacity exactly to the tenth of a cubic meter.

To determine the piston volume of your Chinese scooter, all you need is a caliper. Naturally, these readings will be approximate, since not all engines have the same piston stroke, hence the diameter for the same volumes may differ slightly. But for the most part, most Chinese scooters are equipped with precisely these pistons, the diameter of which is indicated in the table.

Source

How to find out the volume of a scooter!

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How to find out the volume of a scooter!

landman » 24 Feb 2010 02:34

According to the docks there are 50 cubes, the seller claims that there are 82. How can you see for yourself, and visually, so as not to take your word for it?

landman Messages: 12 Registered: Jan 24, 2010 12:24 From: Moscow

ninja » 24 Feb 2010 02:38

Disassemble the moped, measure the piston stroke and its diameter, multiply them, add the volume of the head and find out the volume.

ninja Messages: 5870 Registered: July 25, 2007 18:14 From: Moscow, North-Eastern Administrative District What he drives: RC 51, TDM 900

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Re: How to find out the volume of a scooter!

-=April=- » 24 Feb 2010 03:06

landman wrote: According to the docks there are 50 cubes, the seller claims that there are 82. How can I see for myself, and visually, so as not to take my word for it?

Salon or from hands? What model? What salon?

-=April=- gay Messages: 4431 Registered: June 10, 2009 12:44 From: SEAD What he drives: on nerves

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landman » 24 Feb 2010 04:41

Naturally, we are talking about buying second-hand, but if you go deeper into the essence of my subject, I would like to know... if you put two scooters next to each other (initially it is known that one is 50cc, and the other is 72 or 80cc, for example), how can you determine this visually, without disassembling the engine ! Are there any distinctive features and are there any at all...

landman Messages: 12 Registered: Jan 24, 2010 12:24 From: Moscow

_ » 24 Feb 2010 05:44

landman wrote: Naturally, we are talking about buying second-hand, but if you delve into the essence of my subject, I would like to know... if you put two scooters next to each other (initially it is known that one is 50cc, and the other is 72 or 80cc, for example) how is this possible determine visually without disassembling the engine! Are there any distinctive features and are there any at all...

let's put 2 Mark2s next to each other, one will have a 2.5L turbo engine and the other will have a 3L - well, tell me what it looks like, tell me which one is which?)

, provided that they have the same appearance....m?)

You can’t tell from the outside - just get into the action)

_ Messages: 779 Registered: 03 Aug 2009 18:29 From: Artem City

-=April=- » 24 Feb 2010 06:38

landman wrote: Naturally, we are talking about buying second-hand, but if you delve into the essence of my subject, I would like to know... if you put two scooters next to each other (initially it is known that one is 50cc, and the other is 72 or 80cc, for example) how is this possible determine visually without disassembling the engine! Are there any distinctive features and are there any at all...

Well, just think about it, how can you determine without any analysis what a piston engine costs?

Despite the fact that the appearance of the scooter is completely the same. This is impossible.

There are some scooters that actually have 72cc stock. If you tell me the brand, maybe I can help you with this.

In general, they don’t let you ride a scooter? In terms of speed, it’s immediately clear whether it’s 50cc or 72cc.

-=April=- gay Messages: 4431 Registered: June 10, 2009 12:44 From: SEAD What he drives: on nerves

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GiGA » 24 Feb 2010 07:16

landman wrote: initially it is known that one is 50cc, and the other is 72 or 80cc, for example) how can this be determined visually without disassembling the engine...

if they throw in phenazepam tightly, you should be able to visually determine 50 or 72

GiGA Expert, aka Guru
Messages: 16280 Registered: Dec 18, 2005 21:36 Rides: Perch Gemma and C-Tri-Pi-O

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landman » 24 Feb 2010 10:17

well, to determine on a train - it may be inoperative (or not running), but to disassemble the engine during inspection - not everyone will allow this !!! In short, CONCLUSION - it is impossible to determine externally and, accordingly, you can easily pass off 50 for 80cc...

landman Messages: 12 Registered: Jan 24, 2010 12:24 From: Moscow

-=April=- » 24 Feb 2010 11:19

Well, if it doesn’t go or pulls, why the hell do you need it?

-=April=- gay Messages: 4431 Registered: June 10, 2009 12:44 From: SEAD What he drives: on nerves

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Koldune » 24 Feb 2010 16:44

The volume of the scooter is equal to one third of the product of the area of ​​the base of the scooter and the height

On the move, a 72 cc scooter is easy to distinguish from a fifty-kopeck scooter; it rides completely differently (if we are talking about China). If it doesn’t run, it doesn’t matter how many cubes there are, there is still a high probability of replacing the CPG.

Discolor the lights and wing fasteners with carbon paint. Zeliboba approves

Koldune Messages: 147 Registered: 05 Jan 2008 16:34 From: NN-city

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someone Vasily » 24 Feb 2010 17:39

author, don’t take this moped, it’s Chinese

Velmi loudly laughed under the bench

someone Vasily Messages: 12552 Registered: June 6, 2006 02:55 From: Middle East What he drives: Honda Lead 90

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tolik7788 » 24 Feb 2010 21:14

landman wrote: you can give 50 for 80cc...

200cc for half a ton easily rolls (runner) - two different engines in one body, only a motor battalion will understand such differences (I’m not talking about butchers)

.

I'm driving fast, I'm braking hard - KEEP YOUR DISTANCE. I'm almost Italian...(c)

tolik7788 Messages: 1079 Registered: Nov 27, 2007 10:36 AM What he drives: aprilia

Pri3rak » 24 Feb 2010 22:17

hahaha, the guy bought a Chinese one from a store, they said it was 82 cubic meters, in the end it goes 50 km, it’s possible that there are limiters, but the dynamics in general... pushes off with your feet to accelerate

and so, the volume is written on the cylinder and there is no need to disassemble it, find the current

Pri3rak Messages: 255 Registered: 04 Dec 2007 17:00 From: Udmurt Republic, Izhevsk What he drives: Suzuki Address 50 (tuning)

chop » 25 Feb 2010 12:10

Listen, yes, there is a way like this: you take your engine, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

chop Messages: 439 Registered: Mar 15, 2008 3:28 pm What he drives: tmax/ural

_ » 25 Feb 2010 12:38

chop wrote: listen, yes, there is a way like this: you take your motor, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

kg?

... I didn’t understand anything, what did it come out of - and the volume?) no clue

_ Messages: 779 Registered: 03 Aug 2009 18:29 From: Artem City

chop » 25 Feb 2010 13:26

_ wrote:

chop wrote: listen, yes, there is a way like this: you take your motor, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

kg?

... I didn’t understand anything, what did it come out of - and the volume?) no clue

it is necessary to fill the cylinder through the spark plug hole, shkolota detected

chop Messages: 439 Registered: Mar 15, 2008 3:28 pm What he drives: tmax/ural

_ » 25 Feb 2010 14:12

chop wrote: _ wrote:

chop wrote: listen, yes, there is a way like this: you take your motor, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

kg?

... I didn’t understand anything, what did it come out of - and the volume?) no clue

it is necessary to fill the cylinder through the spark plug hole, shkolota detected

Yes, I finally realized that it’s not through the gearbox blah....

But can you explain it - what is the connection?? and please – intelligibly and understandably

ps: he’s not a shkolota anymore) the shkolota is sitting and fucking in front of the monitor right now)

_ Messages: 779 Registered: 03 Aug 2009 18:29 From: Artem City

chop » 25 Feb 2010 14:18

clarifications for Kamil:D the piston is at BDC. volume = “combustion chamber volume” + “working volume” piston in TDC volume = “combustion chamber volume” “volume” - “volume” = “volume of displaced oil” = “working volume”

chop Messages: 439 Registered: Mar 15, 2008 3:28 pm What he drives: tmax/ural

chop » 25 Feb 2010 14:19

double

Last edited

chop

25 Feb 2010 15:39, edited 1 time in total.

chop Messages: 439 Registered: Mar 15, 2008 3:28 pm What he drives: tmax/ural

_ » 25 Feb 2010 15:26

chop wrote: clarification for Kamil: D the piston is at BMT. volume = “combustion chamber volume” + “working volume” piston in TDC volume = “combustion chamber volume” “volume” - “volume” = “volume of displaced oil” = “working volume”

ps: not Kamil, but “kamika”:wink:

Now) I understand everything now. Sorry I was wrong. I read this post, and yours was the first one – I thought about it, I got it)

_ Messages: 779 Registered: 03 Aug 2009 18:29 From: Artem City

ufo0 » 26 Feb 2010 05:46

Still, it is better to measure the maximum amount of oil in advance, for example 70 cc. cm and infuse during the lower MT. If you lied, then the overflow will occur before the dose runs out.

Then use a blower to suck it out so it doesn’t flow down the engine.

You can also develop a method for displacing air through a candle window. You can pull the balloon or connect a special piston.

Just make sure the compression was high enough.

The word is not a sparrow - you cannot cut it out with an ax.

ufo0 Messages: 2296 Registered: 05 Apr 2006 15:25 From: Southern Administrative Okrug, Chertanovo What he drives: SYM RS150

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Uwd100 » 26 Feb 2010 12:00

chop wrote: listen, yes, there is a way like this: you take your motor, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

uh, what about oil losses in the intake and exhaust windows? Not?

“The sun was shining, night and day there are no atheists in the trenches under fire” Gr. about.

Uwd100 Messages: 4718 Registered: Aug 24, 2009 11:10 pm From: Mytishchi What he rides: on a lawnmower =P

~qazwsx~ » 26 Feb 2010 12:13

Uwd100 wrote:

chop wrote: listen, yes, there is a way like this: you take your motor, the piston is at TDC, fill in oil, turn the engine until TDC, how much oil spills out is your volume.

uh, what about oil losses in the intake and exhaust windows? Not?

no, there aren’t 4t of them

~qazwsx~ Messages: 5163 Registered: Jul 29, 2004 12:25 What he drives: KTM

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Uwd100 » 26 Feb 2010 12:32

oh, are you talking about 4-stroke...

“The sun was shining, night and day there are no atheists in the trenches under fire” Gr. about.

Uwd100 Messages: 4718 Registered: Aug 24, 2009 11:10 pm From: Mytishchi What he rides: on a lawnmower =P

Naster » 26 Feb 2010 13:56

To find out, you need to turn to the battle of psychics!

Naster Messages: 7157 Registered: Jan 17, 2004 03:26 From: Yuvao

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~qazwsx~ » 26 Feb 2010 13:57

at 2t and without bypass everything will flow into the exhaust

~qazwsx~ Messages: 5163 Registered: Jul 29, 2004 12:25 What he drives: KTM

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Mikl » 26 Feb 2010 14:36

And remember Kepler's method for measuring the volume of a barrel?

Mikl Messages: 13830 Registered: May 18, 2001 01:00 From: Moscow What he rides: Hyosung Exceed, Yamaha BWS, Jog Sport Edition

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ufo0 » 26 Feb 2010 17:09

To measure it, you need to get in there... At least know the diameter of the piston, and you can measure the stroke through the spark plug. It also seems like it should leak, if the piston is at the bottom, then it won’t work by displacement. It turns out that either remove the engine cover, or stick something tricky and squiggled into the spark plug hole to measure the piston diameter. The remaining holes can also be used to estimate the diameter, but it is easiest to unscrew the spark plug.

The word is not a sparrow - you cannot cut it out with an ax.

ufo0 Messages: 2296 Registered: 05 Apr 2006 15:25 From: Southern Administrative Okrug, Chertanovo What he drives: SYM RS150

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landman » 28 Feb 2010 04:17

Okay, everything is clear to everyone, thank you for such an extensive debate, I didn’t expect it honestly))))! Another question... in general, what does the presence of 2 rear shock absorbers indicate? just as far as I know (and I know little) usually on single-seaters (50cc) there is one

landman Messages: 12 Registered: Jan 24, 2010 12:24 From: Moscow

Uwd100 » 28 Feb 2010 04:27

to ketai =)

“The sun was shining, night and day there are no atheists in the trenches under fire” Gr. about.

Uwd100 Messages: 4718 Registered: Aug 24, 2009 11:10 pm From: Mytishchi What he rides: on a lawnmower =P

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