Honda dio won't start from starter

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.

Scooters Maintenance and repair

You can often encounter a situation where a warm scooter engine works fine, but when it’s cold, problems arise and starting it becomes extremely difficult, and in some cases, impossible.
However, you will not be able to start the scooter using either an electric starter or a kickstarter. In this case, the problem usually lies in the ignition system or in the power system. Both breakdowns require serious attention and adherence to clear instructions, which I will describe below.

Since most often the problem lies in the ignition system, we will consider this point in more detail. After that, let's move on to the power system.

The scooter does not start when cold due to problems in the ignition system

To begin with, we unscrew the spark plug and examine the electrodes; if they are melted or have any defects, we replace the spark plug with a new one.

If the candle is wet, be sure to remove it from the cap and dry it, for example, I do this on a gas stove. Now insert it back into the cap and check for a spark.

How to check for a spark on a scooter; the scooter does not start when cold due to problems with the spark plugs

To do this, you need to place a spark plug on an unpainted part of the engine, usually the cylinder, and crank the crankshaft using an electric starter or kick. Before doing this, do not forget to turn on the ignition of the scooter. You should not check the spark with your bare hands; you should definitely protect yourself with special thick rubber gloves or a piece of rubber.

Another point to consider is that the spark plug must be kept away from the spark plug hole in the cylinder head, as gasoline may splash out from there and ignite. This has not happened in my practice, but the recommendations should not be neglected.

When the crankshaft is cranked sharply, a blue spark should run through the spark plug, quite powerful and constant. If there is no spark, or it is yellow and appears occasionally, first of all, we take it as faulty and check the spark in the same way on a new spark plug. As a rule, in more than half of the cases, at this stage the problem is solved and the scooter works properly. That is why it is so important to always have a working spare spark plug with you, which will always save you on the road in such a situation.

If, after you installed a new spark plug, the problem remains, we look for a known faulty place further:

The scooter does not start when cold due to a faulty spark plug cap or connection to it.

It also happens that the cap may not be in sufficiently tight contact with the high-voltage wire. To exclude this from the possible causes of the malfunction, we must check it. We unscrew the cap from the wire and bring the wire 2-3 mm to the metal part of the engine. Please note that if, in the case of a spark plug, we pressed it against the engine, then in this case the specified distance must be maintained.

The carburetor is acting up

- 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.

Checking the spark plug

First, the rider needs to check the spark plug, especially if he bought a used scooter. The element must be inspected and made sure that there is no carbon deposits or mechanical damage on it. If the electrode has melted, it is recommended to replace the component. The rider should also:

Clean the spark plug from burning and dirt. It is better to perform the procedure with a metal brush.
Wipe and dry the candle. The element can be held over a gas stove or placed near a heater.
Carry out spark plug diagnostics.

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.

Posts 1 page 8 of 8

Share12014-08-07 14:32:10

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.

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.

I'll make a video later, but that's the point. I tried to describe everything as much as possible.

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.

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Honda DIO won't start

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Honda DIO won't start

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Post by ChudoTxt » 01 Oct 2007 21:58

Re: Honda DIO won't start

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Post by ANDREY » 31 Aug 2022 03:36

Re: Honda DIO won't start

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Post by ChudoTxt » 31 Aug 2022 04:15

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 KonstantinP » 29 Aug 2022 06:44

Re: Honda DIO won't start

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Post by ChudoTxt » Aug 30, 2022 00:14

Play in crankshaft bearings

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.

Source

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:

What to do if the scooter does not start from the starter

Old motorcycles and mopeds were always started with a kickstarter (foot). Smart people thought of installing an electric starter on modern mopeds and scooters, and now you can start by pressing a button on the steering wheel - very convenient! However, you may be unexpectedly upset by the fact that the scooter does not start from the starter and then you have to start it with your foot the old fashioned way. Let's find out about the reasons for this phenomenon and find solutions.

Posts 1 page 8 of 8

Share12014-08-07 14:32:10

Possible faults

Someone may think that there are 159 reasons, and it is unrealistic to do everything yourself. However, repairs and diagnostics can be done independently. The reasons why a scooter does not start can be divided into several categories:

Ignition problems
Fuel problems
Starter problems
Problems with the electrical circuit.

To fully check the moped, you should carry out a comprehensive diagnosis, checking each of these categories in turn.

Fuel problems

In this category, several parts may be faulty. The most common breakdowns are a failure of the fuel tap, a clogged air filter or carburetor.

Remember! If the scooter starts easily from the foot, then this step can be skipped. Go straight to electrical faults.

Fuel tap

This element of the power system can have two malfunctions: fuel does not flow, or gasoline flows continuously. The fuel tap can be diagnosed very simply:

Remove the fuel supply hose from the carburetor and the vacuum hose from the cylinder head cover. Pull air into yourself through the vacuum hose with your mouth, thereby forcibly creating a vacuum. Gasoline should flow from the supply hose. If this does not happen, the fuel valve should be replaced.
If fuel flows continuously from the supply hose, the valve should be replaced immediately.
If fuel flows with difficulty, then replace the fuel filter or clean the vacuum valve.

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

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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