Hello scooter lovers!
Today we will talk about the most common model from Honda - Dio 34, which is a reliable and easy to maintain 2-stroke scooter, but it is sometimes capricious.
Imagine the situation: your scooter stalled and doesn’t want to move on, or somehow started up and you got to the garage with grief. You are scratching your head: what to do? Why won't the dio 34 start? Where to begin?
In this article I offer you a simple algorithm for determining the cause of such a problem.
No spark
To check the spark, apply ground to the spark plug.
- - faulty spark plug,
- — breakage of the spark plug or armored wire, short circuit in the ignition coil,
- - there is no contact or the diode in the ignition switch with three wires on diode 34 is faulty,
- — the switch, generator or hall sensor is faulty.
All this is checked with a multimeter, or, in simple terms, a “tseshka”.
Electrics is a voluminous topic, so I will describe it in another article.
Checking the generator sensor
The magnetic induction sensor is a key element of the ignition system. And if there is any suspicion of a problem with the ignition system, it should also be checked.
Switch the tester to AC measurement mode in the 2V range. With one probe we touch the ground, with the second probe we touch the white-blue or red-yellow wire coming from the sensor and turn the engine with the starter.
- If numbers flash on the screen, there is an impulse
- If the display shows zeros, check the sensor
What to do if the scooter does not start? DIY repair
One of the most popular two-wheeled vehicles in the world is, of course, the scooter! Many people start with them, since this type of motorcycle is characterized by simple operation and an affordable price. But, as a rule, beginners have no experience in repair and maintenance. In this article we will help you figure out what to do if your scooter does not start.
Let's look at standard faults that make the scooter difficult to start. The most important thing in troubleshooting is to learn to recognize it by certain signs and proceed from simple to complex. Sometimes the reason is the most banal - the gas ran out, the battery was discharged, they forgot to turn on the power button or open the gas tap (on a moped).
If these conditions are met, but the scooter still doesn’t start, we dig deeper.
Why doesn't my scooter start after winter?
This paragraph is for those who are confident in the technical health of their scooter and just need to start it after winter.
The secret is that the fuel in the carburetor float chamber loses octane number with each month of inactivity.
You simply need to release the old fuel by unscrewing the drain screw at the very bottom of the carburetor. The old fuel will come out through a hose specially designed for this purpose.
A dead battery is a common problem.
If the scooter does not start from the starter, try starting it from the kick starter. The most common problem is that the battery is simply dead due to a long period of inactivity, or has reached its intended service life. But it also happens that the relay regulator fails or the fuse blows. The fuse is usually transparent and its demise can be determined by eye.
A malfunction of the regulator relay can be determined by starting the scooter with a kick starter and measuring the voltage at the battery contacts. It should not exceed 14.5 V.
To avoid discharging the battery in the future, we advise you to remove the negative terminal, and during winter idle time, keep the battery warm, check the electrolyte level and fully charge it before storage.
The second most common problem is why the scooter won’t start - there is nothing to ignite the fuel, or there is a spark - but there is nothing to ignite. To check the spark, you need to remove the spark plug cap and unscrew the spark plug. It must be dry and clean.
The gap between the electrodes is needed 0.6-0.7 mm. The first sign of a lack of spark is that the spark plug is wet and smells of gasoline. This means the fuel did not burn in the cylinder and remained on the spark plug.
Dry and clean it, then insert it into the cap and lean it against the cylinder mass.
At the same time, press the starter button for a second or the kick starter a couple of times. The spark between the spark plug electrodes should be clearly visible. If there is no spark, then replace the spark plug with a new one, most often this is the problem.
The quality of gasoline in Russia is not very good, this quickly kills spark plugs, especially iridium ones. If a spark does not appear with the new spark plug, we look for a fault in the wiring. A broken wire or oxidation connecting the ground between the frame and the engine is a common problem. Another reason could be a burnt-out resistor in the spark plug cap.
It can be checked with a multimeter; the resistance should be about 5 kOhm. If this is not the problem, then check the ignition coil, this can also be done with a multimeter. In this case, the resistance of the primary and secondary windings is checked. The resistance of the primary winding, as a rule, tends to zero.
Well, the resistance of the secondary should be several kOhms. There shouldn't be a break.
It is also worth checking the switch by replacing it with a known good one.
The next possible malfunction is a break in the wire coming from the ignition switch or the wire coming from the switch. Check the wires for breaks or abrasions. Check the reliability of the female-male plug connections.
If no visible damage is found, a wire break can be detected by testing each wire with a multimeter.
If the above manipulations did not produce results and a spark never appeared, the last reason for its absence is failure of the generator, pulse sensor or generator windings, which happens extremely rarely. The generator windings can also be checked with a multimeter.
If there is a spark, but after that the scooter does not start, there is a high probability that fuel is not supplied. To address this issue, start checking at the gas tank. It is advisable if the gas tank is at least half full. To ensure that fuel is supplied to the carburetor, remove the fuel hose from the carburetor by lowering it into a previously prepared container (bottle).
As a rule, scooters have a built-in vacuum gas valve that opens the fuel supply only during startup or operation of the scooter.
To check the valve with the fuel hose lowered into the bottle, we try to start the engine for 3-5 seconds, or until a stream of gasoline appears.
In this case, the stream must be constant, at least “as big as a match”. If there is gasoline, but does not flow, the gas valve must be replaced.
If it is working, we look for the cause in the carburetor. First, the air filter must be clean. Because if there is a leak at the junction of the carburetor with the intake pipe, air is sucked in there, the mixture becomes too lean and starting the engine will be impossible. Make sure the gaskets between the carburetor are intact. Let's go further, the reason may be in the carburetor itself.
Insufficient fuel
Fuel may not flow due to a jammed carburetor shut-off needle. This is possible when it is clogged, or because the level in the float chamber is out of whack. It is necessary to disassemble the carburetor, blow out all channels and jets with compressed air. You can use a bicycle pump for this.
After cleaning, check that the float and the rubber seal on the shut-off needle are intact, and adjust the floats. The position of the floats must be horizontal.
Otherwise, by bending the tongue under the locking needle, achieve a horizontal position of the floats on the inverted carburetor. After putting it back together, use a transparent hose to accurately check the fuel level. You can use the VAZ washer hose.
by connecting it to the carburetor sump and unscrewing the drain screw, the fuel level should be level with the joint of the bottom cover +/- 2mm as in the figure below:
By the way, if the scooter does not start in the cold, in the morning, or in the fall, then the solenoid enrichment valve is most likely faulty.
Probable causes of breakdowns
Now that the power system is in order and the scooter still doesn’t start, let’s look at another possible reason. It sometimes happens that owners often do not service their equipment on time due to ignorance or other reasons. If the above methods do not produce results, the problem may be with the engine. Check the oil level to see if there is any at all.
On 2-stroke scooters this is required much more often, but it does not need to be changed, only topped up, since it burns along with gasoline. In any case, whether it is a 2- or 4-stroke scooter, when the oil level is low, the cylinder-piston group suffers sharply. Check the compression by removing the spark plug. This is done with a “compression gauge,” but if you don’t have one at hand, you can use your finger.
Posts 1 page 8 of 8
Share12014-08-07 14:32:10
- Author: Advanced
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Hi all. I did a lot of searching on the forum, and I didn’t find anything I needed, there are topics, but unfortunately, after the moped was repaired, the forum members don’t try very hard to write down what happened and what they did.
I bought myself a Honda dio 18, and the next day I noticed that it doesn’t want to start, I have to hold the starter for 10-30 seconds, sometimes, then it slowly starts to grab and starts. If after starting it, you turn it off, then it starts with half a kick. When hot it starts great. Once it started right away in the morning, but that was only once.
What I did: 1. Cleaned the carburetor, set the recommended parameters (I set it after driving and the valve closed) 2. Checked the electric valve, pulled it out - the needle was retracted. After connecting to the battery, the needle crawled within 30 seconds, I didn’t wait until it came out completely, I think it’s clear. 3. Changed the fuel filter. 4. Cleaned the fuel pump, tried to blow it - it didn’t blow in the brother (the valve is working) 5. Cleaned the air filter, 6. Filled it with different gasoline 7. Changed the spark plug, there was a spark in both cases 8. something else in small things, but I think it’s does not apply to cold starts.
You tell me to measure the compression, there is nothing to measure it with, but to buy it - well, how can I tell you, the price of a compression meter is almost the same as a Malossi CPG. So the moped pulls away when cold, I weigh about 100 kg. Our house is located in a lowland, and the road to the top is from 30 to 50 degrees. And the moped pulls me up the mountain, accelerating up to 25 km/h. Moreover, I take the ragon up the hill while standing at an uphill inclination of about 30 degrees. I think the experts will tell you something. Also, sometimes I take my daughter with me to the store, she weighs about 20. I think that there is compression, otherwise I wouldn’t fly up the hill. The previous owner changed the piston about 2000 km
It's hard to start the starter with a kick, it's a little defective, there's a bit of iron on the teeth, and the spring is also weak. So you have to constantly pull the leg back with your hands. And besides, I’m a professional electronics engineer; it’s no problem for me to charge the battery, even every day.
I tried it a couple of times with my foot and then with the starter, there was no effect.
What else can you tell me? There will be a weekend here and I have the opportunity to dig deeper. The maximum speed at which he travels is 45 km/h. from the hill somewhere up to 55 and then you can hear the engine going into overdrive. But they will accelerate to 45 without problems.
At the service station in the motorcycle stable they said that this is normal, either the specialists don’t know what it is, or the rating of this store is falling and stupid mechanics are going to work there.
I'll make a video later, but that's the point. I tried to describe everything as much as possible.
Share22014-08-07 18:34:13
- Author: Mr. Got'e
- Administrator
- From: Karaganda
- Registered: 2011-05-23
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Hello. Explained the problem in detail! There was even a desire to answer and advise! The first thing that comes to mind is really compression. You can measure it without a compression gauge. You unscrew the spark plug, clamp the hole with your finger (tightly) and push the kick with the starter while the throttle is unscrewed. The finger should shoot back. Don't just get up. It is also clear that during a cold start the compression is always lower. After warming up, it increases, which contributes to good engine starting. This is just one option. Secondly, somewhere between the CPG and the carb, air is sucked in (this happened at 150cc). As a result, the mixture is not correct and it is difficult to start. And it doesn't go fast. For Dio 18, 45 km per hour is not the limit at all. I suppose I still got into the piston chamber. Maybe you just need to change the rings. Work for 2 hours, the cost of the rings is cheap. By the way, your KIK starter is not defective. That piece of teeth that is welded is a limiter. Change the spring if it is stretched and put the gears in the factory position! And you will be happy in everything! And your motorbike runs ideally up to 80 km per hour. It's true that you don't weigh much. But still, 45 is just crazy! Good luck!
Share32014-08-08 08:41:17
- Author: Advanced
- 50cc Beginner
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This weekend I’ll go to the car market and buy a compression gauge, I don’t feel the same without it. I'll write back later.
Share42014-08-08 09:39:11
- Author: Mr. Got'e
- Administrator
- From: Karaganda
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This weekend I’ll go to the car market and buy a compression gauge, I don’t feel the same without it. I'll write back later.
Check with your finger. Everything will become clear immediately! Better yet, open up your head
Share52014-08-09 15:13:50
- Author: NOS
- 50cc Beginner
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Guys, I need help, my friend is broken, why can’t I figure out who can help, I’ll deliver to any place in Karaganda very urgently
Share62014-08-09 15:17:32
- Author: NOS
- 50cc Beginner
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In short, I want to repair it, but my hands are in the wrong place; it starts up poorly when cold, and later it stops eating oil altogether, and in general I want capital to be made. Naturally, the issue does not depend on price, you need very good hands and a sober, competent head
Share72014-08-12 09:27:36
- Author: Advanced
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I found someone to get a compression meter, so this weekend I’ll know exactly what the compression is.
I noticed a couple more oddities. 1. When you start it when it’s cold, the moped seems to grab but doesn’t hold the speed. It takes 3-6 to start it. If at this moment you give gas, it immediately stalls. I thought there was a lot of air, closed the air vent with my finger, the effect is the same, 2. When started, it works and does not stall, if you tilt it to the side it immediately starts to stall, is this normal? 3. Most often, when hot after a trip, it does not slow down. What is it and how is it treated?
Auto, Moto
05.03 12:05
Malfunctions, spare parts, service, insurance
Any scooter experts? I haven’t been able to start the boy’s moped for two days. And the moped is a Honda Dio. So that's what I did. I checked the spark, there is a spark (new spark plug). I checked the vacuum pump, the membranes are intact and pumping. The solenoid valve works. The battery is new and turns well. He even grasps it, but... doesn’t want to work. He removed the carburetor, unscrewed the jets, washed everything, blew it out. He even removed the gas tank, poured out the old one, and poured in fresh gasoline. What else does he need?
Continue topic
Yes, sometimes little things happen. I couldn’t start because the fine filter was in the opposite direction and was compressed due to this
Unscrew the spark plug, pour 40 grams of oil into the cylinder, pump it with the kickstarter a couple of times. Screw the candle back. Try starting it. If the compression is weak, it helps (Added after 30 seconds)
Change your rings
No rings, no piston... Problem found. There was an air leak in the carburetor float chamber. I made a gasket and it works like a charm.
The motorcycle itself has a new piston and rings. And it will fly like a native. My son had the same problem. He cured it in an hour and a half. And use good 2-stroke oil.
I don’t pour oil into the oil tank, but mix it with gasoline. I recommend it to everyone.
I wrote a solution to the problem above.
ignition control unit.
no compression, replace the rings.
“Marine Service” (Mira 29a) has been working with various small-engine equipment for twenty years.
Maybe the petal valve, the body was deformed, the petals did not fit well, they also suffered for a long time until they found the cause
maybe the chain jumped and the ignition went wrong
What chain? Timing? Isn't the Honda Dio a two-stroke?
nope four
Check the compression and remove the muffler as described below.
Try disconnecting the muffler and starting it, even if you close it with your finger the scooter stalls.
I'm going to film. (Added after 12 minutes)
Disconnected. I grabbed it, even ran it for 30 seconds, and died. Doesn't grab anymore.
Check the compression, it looks like it's bad
Load more
Good afternoon The Scher-Khan Universe 3 telematic security system was installed on the Subaru Forester SJ5. With the advent of frost, the autostart stopped working. Everything worked fine until sub-zero temperatures. In the application settings, all autorun restrictions are disabled. What could be the problem?
Fellow countrymen, tell me who is in the subject. Where to buy a clutch disc and small items for a Chevrolet Niva? Thank you.
Why do they close the registration when selling a car? numbers? Makes me suspect that something is wrong with the car.
All roads are wet in the morning -15
dunces in business, useless workers, pests.
Good evening, dear forum users, please tell me, otherwise I’ve already lost my mind where to go, what to look at. So, when you smoothly accelerate from 0 to 30 approximately, the car experiences a certain vibration, as if you were driving on an uneven road, it’s so smooth, it feels like the rear wobbles. As a result, I changed the tires, wheels, cardan with suspension together, gearbox, rear drive, but the vibration remained as it was. The car is Mark X, 4 wd
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Honda DIO won't start
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Either the petal valve does not close hermetically (the petal is broken, or debris has entered), or the crankshaft oil seal has been squeezed out (more often from the variator side). What kind of Dio? What compression? The seals are checked by pouring gasoline into the crankcase with a syringe through the drive tube of the vacuum fuel pump, to a level just above the seals (wait 5 minutes, make sure there are no leaks, drain the gasoline through it, crank the engine with an electric starter (without a spark plug!) until dry), and then climb into the petals (no sealant of any kind! Only gaskets!)
Re: Honda DIO won't start
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Post by ChudoTxt » Aug 30, 2021 00:14
The carburetor is acting up
- — the main jet or idle jet is clogged,
- - low-quality or long-stored gasoline in a canister with an open lid,
- - the needle does not keep the level in the carburetor and therefore fills the spark plug,
- - if the scooter starts poorly when cold, but starts normally when hot, this means that the cold start system is not working.
It is advisable to adjust and clean the carburetor once a season.
Why does my scooter stall?
The operation of a scooter can be quite unpredictable, even despite the simplicity of the engine and the entire design. But when a breakdown occurs, it is sometimes quite difficult to determine the cause and make repairs. One of the most common problems is when the scooter stalls. This can happen in two cases - while driving and while idle with the engine running. Many people ask: why does the scooter start and stall? Experts identify three main reasons - carburetor, spark plug and wiring.
Exhaust pipe clogged with carbon deposits
In this situation, the scooter does not pull at all and stalls.
You need to remove the pipe and check it for ventilation. There may be carbon deposits inside the pipe or some partition has broken off, blocking the exhaust.
You can also check the pipe without removing it from the scooter: at idle, if the pipe is not clogged, the smoke comes out in a pulsation, approximately at the beat of the engine.
And if the pipe is clogged, then the smoke comes out at high speed in a continuous stream. This indicates a reduction in the throughput hole in the exhaust pipe.
Why does the scooter stall while driving: moisture on the electrical wiring
In this case, when the scooter begins to stall while driving, it can only work again after being idle or drying out. Oddly enough, but water or moisture getting into the electrical wiring can greatly reduce the voltage and it will not be enough to create a spark. After the scooter has been standing for a while, it can work stably again. If your scooter stalls while driving precisely because moisture gets on electrical appliances, then you urgently need to seal them. At a minimum, wrap weak points with electrical tape.
Poor compression in cylinder 2t engine
As a result, the combustible mixture does not enter the combustion chamber well.
Good compression is felt by the foot when starting with the kickstarter and when measured with a compression meter it is at least 10 bar.
Due to insufficient compression, the vacuum fuel pump may not work well.
The serviceability of the fuel pump is easy to check: remove the gasoline supply hose from the carburetor and push the kickstarter with your foot.
If the fuel pump is working properly and there is good compression, gasoline should flow out of the hose in copious drops. If gasoline does not flow, then you need to determine what is faulty - the fuel pump or the piston group.
Preliminary inspection of a motorcycle Minsk
Everyone understands that for stable operation of a motorcycle engine it is necessary that the required amount of fuel enters the cylinder. It is also required that there is a good spark at the spark plug contacts.
If the Minsk motorcycle does not start, this means that fuel is not entering the combustion chamber or there is no spark. You should not rush to unscrew the spark plug or remove the carburetor, but rather listen to the opinion of experts who recommend starting to eliminate this problem with a simple inspection.
When inspecting a Minsk motorcycle, you need to check the following:
- the presence of gasoline leaks on the hoses and the engine, after making sure that the gas tank tap is open;
- presence of parts of damaged motorcycle electrical wiring.
If an inspection of the motorcycle does not reveal possible causes of the malfunction, then you need to move on to the next step.
What to do if the scooter does not start? Tips from the master
Quite often you can see cases when the owner is faced with the following problem: the scooter will not start. This may be due to a large number of reasons. Most often these are typical breakdowns or malfunctions, especially if the moped was parked in cold weather. Depending on the identified problem, the moped can be repaired in a few minutes or several hours.
Typical reasons
First of all, you need to check: the ignition and power systems. Carry out a check in those places that can cause the moped to move. The reasons why the scooter does not start, especially in cold weather, may be the following:
No spark in spark plug
The scooter does not start because there is no spark in the spark plug. In this case, you need to do the following: the spark plug is unscrewed and checked for suitability. Connects to the ignition coil using a wire. Placed on the cylinder. When the crankshaft rotates, the spark at the spark plug is checked. The scooter will not start if there is no spark at the plug, or there is a spark, but it is inconsistent.
Reasons for the lack of spark on the spark plug
Cold weather
The scooter may have difficulty starting in cold weather if there is a problem with the spark plug cap or its connector. In such a situation, the cap is unscrewed from the wire, and the wire is brought 0.3 cm closer to the metal motor element to crank the crankshaft.
Why does the scooter stall while driving: spark plug
If a lot of carbon deposits form on the spark plug, this prevents the spark from flowing, which means the fuel cannot ignite. The spark may not be supplied as needed, for example, not every spark will be able to pass through the carbon deposits, so the scooter may work unstably and stall. Or the carbon deposits that have formed on the spark plug completely prevent the formation of a spark. Sometimes, when the scooter engine is running at high speeds, the spark plug can self-clean. In this case, it will be ready for work again and the scooter will not stall for some time while driving. But the candle does not always clean itself. If the reason that the scooter stalls while driving is precisely carbon deposits on the spark plug, and this happens very often, then the following partial sawing off of the side electrode may help. The problem is that if it helps someone, it may not work and you will simply ruin the candle.
Play in crankshaft bearings
This happens often.
If the bearings make noise when the engine is running, then radial play appears in them, which leads to wear of the seals.
As a result, air leaks through the seals, the combustible mixture changes its composition and does not ignite well.
This is a rather complicated repair. It requires removing the engine to replace bearings and seals. A beginner may not be able to handle it; he will probably bend the shaft. It's better to turn to professionals.
So, we have looked at the most common reasons - why the Dio 34 and other 2-stroke scooters do not start well or do not start.
I hope that the article will be useful to you.
Bye everyone!
Take action and you will succeed!
Removing the rev limiter in the Honda dio af 34/35 switch
This article is suitable for Honda Dio AF 34, 35/35 SR/35 ZX scooters. ATTENTION! The speed limiter can be removed only for switches marked: CI649 and CI649A. For switches with other markings, it will not be possible to remove the limiter, and if you try, you will simply ruin the switch, and your scooter won’t even start...
If you don’t know how to solder, then contact a friend who knows how to do it and show him this article, and if you don’t know such a friend, then contact any electronics specialist or auto/motorcycle specialist and also show him the article, he He will do everything for you.
How to remove the switch and where is it located?
The switch is located at the front of the scooter under the beak (the largest part of the plastic is at the front). The beak is attached to 3 large bolts in front, and 4 under the dashboard (two on each side), unscrew 3 large and 4 small bolts. Now you can remove the beak! Removed? Now we are looking for a metal platform:
The photo shows the switch
has already been removed, you just need to pull the switch up (you can help with a flat-head screwdriver) so that the switch is removed from the metal fasteners (marked in the photo). Filmed? Now, as you can see, the wires are connected to the switch, disconnect them (then it will be impossible to connect them back incorrectly, so don’t worry
The limiter in such switches is a capacitor (such a yellow plastic piece), which will need to be soldered to another (the price is no more than 3 rubles), the approximate location of the limiter is in the diagram. Next, let's get to work...
Turn on the soldering iron and take a craft knife (you can use a simple one, but make sure it’s well sharpened). We take the switch and begin to pick it apart as shown in the diagram:
To make it easier to pick out the sealant, you can remove the side plastic walls (at the edges of the place that is marked, do not throw away these plastic walls.), it is better to do this right away, because when resoldering the capacitor you will still need to remove the walls, these walls are plastic and can be remove with a soldering iron (what the switch will look like after removing the walls is in the photo below). You need to pick the sealant very carefully, remove it millimeter by millimeter, otherwise you can damage the parts. After 20-40 minutes of work you should see a yellow plastic piece (this is the limiter
), you should not pick the sealant beyond the marked area, this is not necessary and you can touch other parts. Next, we pick out about 2-3 mm of sealant around this yellow plastic piece (capacitor) so that it can be removed. You should get something like the picture:
Causes of the problem
Even if the engine was able to start, the problem will occur again. If this is not the first time a spark plug on a scooter has been flooded, it’s worth finding and fixing the problem. The culprit could be:
- Dirty air filter. If there is not enough oxygen in the fuel mixture, the gasoline will not burn completely and will remain on the spark plug.
- Mixture quality screw. If the carburetor is not adjusted correctly and the screw is too tight, a similar problem will occur.
- Poor quality fuel. Gasoline diluted with another liquid can also cause this.
- Defect in the ignition system itself. There is no spark, or it is not powerful enough to ignite the mixture.
- Low battery. On days when the temperature drops below zero, you need to make sure that the battery is well charged, otherwise a similar problem will arise.
Flooded candle
Sometimes, if a candle is wet, it is enough to simply dry it. But this will not eliminate the problem and will not prevent this unpleasant situation from occurring in the future. While almost any of the problems described can be dealt with on your own.
How to restore starting from the starter
The moped does not start well from the starter, however, doing it from the foot is simple and easy. If the engine does not start well from the starter, you must first check the fuse located in the battery compartment.
The location of the fuse on the battery is marked with an arrow.
Due to the often poor quality of the manufacture of the fuses, and, consequently, the entire starter, the wire located inside the starter glass bulb can barely touch the contact caps, which is why the fuse contact becomes unsuitable. After the low-quality fuse has been replaced, the moped can be started using the starter.
