Scooter tuning - accelerating the moped to full power

Scooter tuning, how to properly tune a scooter Scooter tuning using the example of Honda Dio AF-18 Remove 50 - put 72. Replacing the piston on a scooter CVT tuning. Adjusting the weight of the variator weights using available materials

How do you do your own scooter tuning? Why does a scooter need tuning at all? To answer, we need to figure out why we need a scooter at all?

It’s one thing when a scooter makes it possible to forget about traffic jams and heat, and the fuel consumption is minimal. Everything is clear here with fifty dollars - the time comes when more dynamics and maximum speed are required/wanted. By intelligently approaching increasing the performance of a scooter, we will get the desired result. It’s another matter if we have a scooter as a means to stand out from the crowd, to amaze everyone with amazing acceleration and an impressive bass note from the exhaust. Here the direction of tuning is completely different. And in general, it often makes sense to simply change the scooter to a more powerful one rather than tuning a fifty-kopeck piece.

Speaking of low-budget boosting, click here, Cheap tuning of the Honda Dio scooter, and read the article about wallet-friendly tuning.

Well, later in this article we’ll talk about how and what to do for tuning, and for serious tuning of a scooter, with your own hands or someone else’s, and most importantly, wisely. And to such things as His Majesty, sir, “big scooter tuning”, i.e. Scooter tuning, which is noticeably superior to budget ones both in scale and in cost, must be approached extremely meticulously and carefully. This means that you can’t do it without the skill and instinct of a mechanic.

However, let’s start small here too.

So, after running in and removing the speed limiters (chokers), we have several ways to increase the maximum speed a little and get a much more powerful engine with almost the same resource. Don’t forget about the technical condition of the remaining parts and components of your scooter, otherwise the simplest and most inexpensive do-it-yourself tuning can result in a rather complicated and expensive scooter repair! already, perhaps, by someone else’s, more skillful hands . So:

• Change the scooter muffler to a tuning resonance pipe that fits your CPG (pipes such as Laser X, LeoVince ZX, Technigas Next - R in various versions may be suitable) or to a “torque” exhaust (Polini No Smoke, LeoVince SP3/Turing, Techigas Silent Pro). Also rebuild the transmission part in accordance with the characteristics of the installed tuning pipe. This will allow you to raise the maximum speed of the scooter by another 10-15 km/h (for resonant exhaust) and will give an increase in dynamics.
• Get a carburetor with an optimal diffuser diameter. For 50-70cc, the most convenient to configure and install is a carburetor with a diffuser diameter of 17.5 mm, the most commonly used carburetor. There is an opinion that DellOrto tuning carburetors are of the highest quality, although by and large, the manufacturer does not really matter.
• CVT - replace with a sports one. In tuning CVTs, the process of adjusting to new parameters of a scooter’s engine is more accurate and of better quality - due to more advanced kinematics of moving weights. Tuning CVTs produced by Polini after 2005 are equipped with a rod lubrication system, which increases the efficiency of the entire scooter transmission. And due to the smoother and easier movement of the variator cheek along the guide sleeve, it improves the acceleration response of the scooter.
• The main way to increase the power of a scooter is, of course, to install a Sport class of increased volume. Generally speaking, this is the most radical and most effective method of increasing the performance of a scooter. Thus, you not only have an increased cylinder volume, but also a more competent and thoughtful system of the cylinder purging process (for a two-stroke engine) - that is, even more power. The main difference between two-stroke piston tuning kits from different manufacturers is precisely the different placement of windows. A cylinder head with an optimized combustion chamber shape - usually complete with a tuning CPG. Keep in mind that when installing piston engines with a larger piston diameter (volume), it is extremely important and necessary that the crankshaft and bearings be in perfect technical condition, otherwise large loads will simply destroy them very quickly.

In principle, the average person can stop at this level of scooter tuning, because the next stage is do-it-yourself scooter tuning, which allows you to develop up to 12-17 hp. on the shaft - this is the “design” of an engine on a tuning piston class Mid-Race and Race. And this is a qualitatively new level of tuning, and as mentioned above, for many it is easier to simply purchase a more powerful stock scooter than to tune it. So, tuning Mid-Race and Race class scooters.

Such engine tuning requires the installation of a reinforced crankshaft - with suitable bearings and a corresponding reinforced connecting rod. Only such tuning parts of a scooter engine are able to withstand increased shock loads and realize new power. Otherwise, you can forget about stable and trouble-free operation of the engine.

The crankshaft speed of an engine of this class begins to set the rhythm. 10,000 rpm requires adequate reliability of the components, which stock (i.e. standard factory) parts, such as main bearings, are not able to provide. In addition, the new thirsty engine needs appropriate power - the diameter of the carburetor diffuser should not be less than 17.5 mm for a racing piston engine. Also, the carburetor setting for this tuning engine must provide a good mixture at high speeds, otherwise overheating and further “sticking”, and in severe cases, the wedge of the cylinder cannot be avoided. It would be nice to install a 19 mm carburetor paired with a tuning sports air filter.

In fact, all the following steps for further tuning the scooter with your own hands will repeat the previous stage of boosting, only with the difference that it is necessary to use higher quality and more productive components of tuning kits. That is, instead of a regular sports CVT, it is strongly recommended to use Polini Evo or Malossi OverRange transmission tuning kits.

Tuning in this class allows you to develop dizzying dynamics and a hurricane maximum speed of over 100 km/h. In general, for normal use of a scooter in the city without too much investment in fuel and lubricants and consumables, this is the maximum possible tuning of the scooter. But such tuning allows you to enjoy real amazing dynamics and speed (this especially traumatizes the already unstable psyche of drivers of pseudo-sports cars, who for some reason underestimate the possibilities of tuning a scooter with their own hands and are perplexed when a “crazy stool” gives them heat from a traffic light as if they were standing , and often leaves them no chance for revenge ).

So we have reached the pinnacle of boosting - tuning a Hi-End . These are uncompromising solutions that allow you to increase the liter power of a scooter engine to a figure exceeding 300 (three hundred!) horsepower per liter of volume! And this is without the use of all sorts of turbines and other sophisticated solutions like nitrous oxide or special fuel!

There are not so many companies involved in such developments. The main players in this field are Malossi, Polini, Kunda, 2Fast, Fabrizi, MetraKit. These are elite components and a triumph of high technology.

With this tuning, engine speed comes close to 20,000 rpm! There can be no savings here, the work is only for the result - the task of such a motor is to work out two 15-minute sessions and several hours of training, after which it is sent for inspection and subsequent replacement of worn-out components. Even crankshaft bearings most often come in special series and can only be purchased from the tuning studios themselves (Malossi and Polini have their own special bearings that were developed and manufactured exclusively for them).

Installation of the crankshaft, CPG and other components requires a very serious modification of the engine crankcase and chassis of the scooter; the use of rotary ignition is mandatory (which allows you to spin the engine to insane speeds without losing spark power), which implies the absence of all electrics not related to the scooter’s ignition system . The ratio in the gearbox is left to the taste and wishes of the owner.

The best examples of fine-tuning scooters using components of this class allow achieving time at a completely “adult” distance of 402 meters within 12-14 seconds, and not everyone, even seriously “charged” cars, are capable of such “feats”.

In urban use, the service life before replacing the ring is expressed as a figure from 1500 to 4000 km, so if it is possible to “feed” such an engine with first-class 98 gasoline (not the kind that is poured at 99% of gas stations, but real) and very expensive oil, then you can and sometimes ride such a monster to scooter-moto parties and amaze the imagination of those passing by with shining sides and polished engine covers, and after the cool motorcycle racers stop nervously giggling from the chirping of a newly started engine, accompanied by a fair amount of smoke from the exhaust pipe (you will have to pour oil “by eye” and, preferably, and, naturally, in not the most optimal proportions), open the trigger fully and take out a couple of “purebred” (ZZR 400 =) sports bikes. So let someone after this say that scooters are consumption for children “under 16”...

This, in general terms, is all about tuning scooters with your own hands. But each scooter is unique, each scooterist has his own requirements, so each scooter should be prepared based on many conditions - budget, requirements and the feasibility of one or another modification, because it is not for nothing that there are so many “transitional” classes on the scooter tuning market that do not fit into the standard ones the framework of one or another forcing class.

The following is a list of tuning kits provided by various scooter parts manufacturers.

We adjust valves (4t engines).

As mentioned earlier, the engine must be serviced before boosting.
Work that will help improve dynamics includes adjusting the valves. The procedure is suitable for tuning Chinese 4t scooters and other 4-stroke engines. For small-capacity equipment, it is recommended to carry out such adjustments at least once every 3, and preferably once every 2 thousand km. It is also necessary to carry out adjustments after manipulations with the CPG. Before you begin, you need to make sure that the engine has completely cooled down and that you have a set of keys (8,9) and feelers of 0.05 for the intake valve and 0.07 mm for the exhaust valve at hand. You can get to the adjusting nuts by first removing the valve cover. When access to the valves opens, the piston is installed at top dead center. Next, a feeler gauge is installed in the intake valve gap and, depending on the current position, an adjustment is made.

To increase or decrease the clearance, you need to loosen the lock nut (while holding the adjusting bolt), turn the adjustment bolt and, while holding it, tighten the lock nut back. Thus, we achieve a gap when the probe passes into it with little effort. After adjustment, make a full revolution of the crankshaft and make sure that the adjustment is accurate.

Medium and high speed tuning

The quality screw prepares the mixture ratio at idle. Failures in operation at high modes are eliminated in other ways.

After opening the throttle valve, the fuel nozzle comes into operation. Its task is to supply gasoline to the diffuser while the scooter accelerates.

An incorrectly selected nozzle leads to deviations in the composition of the fuel mixture. During power build-up, the scooter may “suffocate”, until the engine stops completely.

The correct algorithm for tuning the carburetor at high speeds:

• cleaning internal channels from debris;
• checking the fuel level in the float chamber;
• adjusting the shut-off valve (needle) stroke;
• checking the jet's nominal value.

A sign of proper operation of 2t and 4t engines is a sharp increase in speed when the gas is opened. Any deviations from the stability of engine acceleration indicate a violation of the settings.

Signs of deviation in mixture preparation

An important indicator of the quality of fuel combustion in the cylinders is the color of the spark plug. An experienced mechanic only needs to look at its condition to understand what adjustments need to be made.

There are two characteristic colors:

1. A white (grey) spark plug means the mixture is lean, the moped overheats and does not produce optimal power.
2. Black with soot – excess fuel, excessive consumption.

The behavior of a scooter with an incorrect fuel mixture is specific:

• abnormal reaction to the throttle;
• pops in the muffler;
• smoke content of exhaust gases;
• noticeable decrease in power characteristics;
• sudden engine stop.

A normal moped spark plug is brownish in color. There should be no carbon deposits on it, its electrodes should be clean, without traces of melting.

Scooter tuning – clutch tuning

Backlight

An excellent option for adding individuality to your scooter is to install additional lighting. The most common type of implementation of such an event is the installation of LEDs. The main positive point in this process is the minimum energy consumption that is necessary for the operation of the diodes. They can also be mounted on wheels. And on the dashboard, and even on the headlights. The LEDs under the bottom of the scooter look no less original. At night, they can be used to additionally illuminate the road. And it will be easier for other road users to see the scooter rider.

A good option for external tuning is to replace the front headlight with a more advanced and brighter one, which together with the installed LEDs will look very impressive. Many scooter owners immediately after purchasing a vehicle try to replace the factory mirrors with darkened or tinted counterparts.

To summarize, I would like to note that the option of making changes to the appearance of the scooter depends on the financial component and imagination of the owner of the scooter. In any case, this process can be turned around, since tuning a scooter is a field for implementing the most sparkling ideas and plans, which very often become the founders of new trends in styling.

There is no need to be afraid of experiments, especially now, when you can find any structural element or part on store shelves. But you shouldn’t forget about a sense of proportion.

In our country, scooters are a fairly popular two-wheeled vehicle that occupies the minds of young people, as well as older men and women. It is not surprising, because there is no longer such a miniature, economical and convenient in many ways transport, at a reasonable price. However, despite its modest dimensions and tiny engine, the scooter can also be quite fast. In this article we’ll talk about scooter tuning, what it is like and how much it costs?

Scooter tuning – intake pipe tuning

The gasoline-air mixture prepared by the carburetor then flows into the crankcase through the inlet pipe. This part is sometimes mistakenly called a manifold, which is incorrect, since this pipe does not collect anything, but only directs the mixture into the crankcase

It is important that the flow area of ​​this part is no less than the size of the carburetor, otherwise there is no point in installing a carburetor!

The flow area of ​​the standard pipes on most scooters is such that you can easily use a 17.5 mm carburetor instead of the standard one. The same cannot be said about 19 mm carburetors! What can we say about such scooters, subjected to grief tuning with the help of 21 or even more carburetors without replacing the intake pipe!? Through tears we call these “scooters named after the 19th carb”..

An anecdote comes to mind: Stirlitz gave the dog gasoline and let him go. The dog ran 5 meters and fell. “The gasoline has run out,” thought Stirlitz.

Cylinder-piston group.

Finally, the most effective improvement for any engine is replacing the CPG. But not just a replacement, but the installation of a new, larger piston. Fortunately, there are now many ready-made kits on the market; you don’t have to sharpen or adjust anything, as with Soviet equipment. Moreover, there is even a lot to choose from. For example, for various models with a volume of 50 cubic meters, they offer kits to increase to 63, 72, 82 and even 90+ cubic cm. In some cases, this is an almost double increase in power.

The situation is similar with larger engines, for example, for 125 cubic meters, sets of 150 or 170 cubic meters are sold. Some, in the process of tuning a scooter, manage to increase 150 cubic meters with their own hands to 225 cubic meters. Choosing the right part is not the most difficult thing, the most difficult thing is installing it. After all, this process involves almost complete disassembly of the engine. You will be faced with the need to have several special removable keys in your arsenal; you can ask them from friends or borrow them for the evening at auto repair shops. We strongly recommend studying the technical component in order to properly disassemble, replace the necessary elements and assemble the motor.

Alas, for some, increased power does not promise anything other than breakdowns or inadequate performance. This is because by significantly increasing power, you inevitably entail work on all other nodes. Let's imagine that we installed a new 92 cc CPG on an old 50 cc engine. The first thing to check is the condition of the connecting rod, crankshaft and bearings. Otherwise, they will fly first, followed by our new system of both cylinder and piston.

Great, we added new bearings to the CPG, an elbow with a connecting rod, now we can be sure of reliability. But the engine does not go faster, and we decide to purchase a new carburetor. Now the mixture is too rich, and we understand that the exhaust needs to be changed. After such modifications, the engine sounds loud, accelerates perfectly, but the maximum speed is slightly higher than before and the variator sounds strange. After installing a high-speed CVT, for example from the Italian manufacturer Polini, the engine will be able to fully realize its new power. The last stage is an inspection of the brake system; you don’t want to find out at a speed of 60 km/h that the brakes are now comparable to bicycle ones.

As a result, after replacing almost all the components, we got a very fast “flea” that can surprise your friends and experts in this technology. Over time, you can make changes to the chassis system, replace shock absorbers, and install more attractive wheels. Often, the modernization process does not stop there, and after tuning a scooter 50, 150 with your own hands, impressive improvements in appearance are made. The moped is repainted, panels are changed, new devices, lighting, and so on appear.

1 Classification of motors and upgrade options

Today, scooters are available with several types of motors. The most popular version of a small cc engine is the Chinese model 139qmb with a displacement of 49.6 cc. Next comes the 153QM model with a volume of 150 cm3 and the 157QMJ with a volume of 150 cm3. Thus, within each type of Chinese motor, the main engine parts are in principle interchangeable. This means that finding parts becomes an easy task.

Previously, the most popular scooter tuning kits were “whales” from Italian manufacturers Pallinni, Mallossi or Metrakit. These tuning kits, as a rule, include a huge range of parts, accessories and equipment for tuning scooters from well-known European, Japanese and Chinese manufacturers. However, in the case of Chinese-made mopeds, tuning with the help of European “whales” is too expensive for ordinary motorcyclists, and there are more and more Chinese scooters on our roads every year.

Today, tuning a scooter mainly comes down to increasing the engine capacity. The most tuned engines are 139qmb engines with a volume of up to 50cc. For example, instead of a standard piston and cylinder of 39 millimeters, wider analogues with a piston diameter of 44 to 50 millimeters are installed. In contrast to European and Japanese-made models, tuning of the “Chinese” mainly comes down to an increase in cubic capacity, as a result of an increase in engine power and the need for appropriate adjustment of the variator and other parts. And if with a 44 mm piston you can leave the factory cylinder head, then when replacing the 39 with a 52 mm version, you will have to change the cylinder head and recalibrate the carburetor. Thus, the easiest way to increase the cubic capacity for a 139qmb engine is to install a 44 mm piston, and you will also need to purchase additional gaskets. As for the larger Chinese-made engines (157QMJ and 153QM for 150 cm3), they are built on an identical platform and externally differ from the 139qmb model only in their longer length.

Scooter tuning – air filter tuning