The engine is the most complex system of any motorcycle, which is most susceptible to negative environmental influences. If your Minsk motorcycle does not start after a major overhaul, winter downtime, or for no apparent reason after an hour-long stop somewhere along the road, then this article is just for you.
The reasons for a motorcycle engine failure and the conditions leading to it may be different. Performing the following simple steps can help you quickly find and fix the problem without the help of specialists.
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.
Why is there a weak spark on a motorcycle?
You should not immediately “blame” the ignition system for the malfunction. As practice shows, it fails and provokes the problem of a weak or irregular spark much less often than the wrong fuel mixture gets into the tank. Either too lean (for example, after a long period of inactivity), or too rich (if the fuel from the float chamber has managed to wet the cylinder).
There are often cases when, in the process of troubleshooting, the driver simply discharges the battery. And now the battery cannot produce enough voltage to produce a spark. This should be taken into account when repairing a motorcycle.
If you are sure of both the quality of the fuel and the condition of the battery, check all wires and contacts, as well as the breaker contacts and the capacitor. Sometimes the reasons for a weak spark on a motorcycle are hidden precisely in the lack of stable contact between the conductors. By the way, cleaning the candle itself can also help, although it must be done carefully.
Sometimes, even quite often, the problem lies in the development of the plug on the coil. The plug itself can be replaced or slightly crimped. And the contact must be cleaned. If this does not solve the problem, then you will have to continue the search inside the coil and high-voltage wire. If the motorcycle has a weak spark:
● check the resistance between the low-voltage terminals of the coil - it should not exceed 1 Ohm;
● Next, you should measure the resistance between one of the low-voltage terminals and the high-voltage one - it should already reach a kilo-ohm.
Worth knowing! If you need to replace the ignition coil to check for spark, you can install any analogue from a 12-volt, non-injected motorcycle. Or even take a reel from a Zhiguli car.
If your motorcycle runs on a multi-cylinder engine, one of the cylinders simply refuses to work, you can recheck all the elements of the ignition coil using a simple method of selecting serviceable/faulty parts. As a last resort, you can turn off one of the three cylinders (which turns out to be faulty) and drive to a garage or repair bay. To do this, you need to disconnect the cable from the carburetor or open the contact on the injector.
Checking the fuel system
Checking whether fuel is entering the carburetor is much easier than checking whether there is a spark at the spark plug. To do this, after making sure that the gas tank tap is open, you need to press the carburetor float release. If after 30 seconds of waiting the fuel still does not flow, you should pay attention to the following:
- make sure there is fuel in the gas tank;
- check if the gas tank tap is clogged with any debris;
- Check to see if gasoline flows freely through the fuel hose.
If you managed to fill the carburetor with gasoline, you can safely try to start the motorcycle. But if the engine still fails to start, then you need to check for a spark at the spark plug.
Spark test
To check the Minsk motorcycle, you need to remove the spark plug and unscrew the spark plug. Next, you should immediately determine (wet or dry) the spark plug contact.
If the contact is wet, then most likely there is a problem with the spark plug in your motorcycle. If the contact is dry, then you should look for a problem in the carburetor.
Since the spark plug has already been unscrewed, you can diagnose and verify its functionality. Before checking for a spark, the correct gap between the spark plug electrodes should be set.
According to the technical recommendation of the Minsk motorcycle manufacturer, the required gap should be from 0.4 to 0.7 mm, depending on the model. The gap is set using a feeler gauge, which can be purchased at any auto or motorcycle parts store. If you work on the Minsk motorcycle yourself, then this tool should already be in your kit.
To check the spark on a removed spark plug:
- insert the candle into the candle holder;
- short-circuit the spark plug body to ground;
- activate the winding stem.
Attention! When checking the spark plug, you must hold it only by the installed candle holder, otherwise electric shock may occur.
It should also be noted that spark is different. The correct working spark should always be the same, clearly visible, and always pass in the same place.
If a spark does not jump between the contacts of the spark plug, then it is necessary to check again, but using a different spark plug. If after re-checking a spark appears, this indicates that the installed spark plug was faulty and should be replaced. If there is still no spark, then you need to check the ignition system of the Minsk motorcycle.
Motorcycles Ural and Dnepr
yurg
Can the engine start and run with a faulty ignition system capacitor?
The engine starts and runs very poorly. The spark is very weak. The gap in the breaker is normal. I checked the high-voltage wires. Pensioner
If the capacitor is faulty, increased sparking is observed at the contacts.
And a weak spark is an eternal problem. On the MT10, one friend installed 2 Izhevsk bobbins at 12 volts, before that he tested it on auto bobbins, after which the spark became lethal and the motor started up with half a poke. To install, you need to hook up 2 reels in parallel, each high-voltage terminal to its own spark plug. serjant
weak spark: 1. with weak battery.
2. if the conduit is broken. 3. with a broken woman. Conclusion: with a broken condenser, anything can happen, including a weak spark. You can also experience a drop in speed, a sneeze in the cylinder, and other gimmicks. 7Joker
Look at the spark plugs, set the gap.
If the ignition is electronic, the gap should be less than with a cam. sergeant
quote: Look at the spark plugs, set the gap. If the ignition is electronic, the gap should be less than with a cam.
Uncle, I’m sorry, but I’ll correct you….. when using electronic ignition, the gap is set larger than with a contact one, since there the spark force is much higher than with a contact one, this is one of the advantages of electronic ignition….
samopal
when the conder is broken, the spark is very strong, I checked it myself.
z.y. ride without conder gentlemen bike
quote:
Can the engine start and run with a faulty ignition system capacitor? The engine starts and runs very poorly. The spark is very weak. The gap in the breaker is normal. I checked the high-voltage wires.
bike,
if the generator is 12V, feel free to install a 6-volt coilover and you will start in no time, one difficulty with this is that sometimes you have to check the contacts of the
7Joker
for serjant
: No, I’ll correct you.
If the gap is large, when the throttle is opened sharply, the spark jumps not in the spark plug, but at the coil contacts, as if the cap was removed. Problem with electronic ignition. The gap should be minimal. Tested on more than one bike. sergeant
quote:
. If the gap is large, when the throttle is opened sharply, the spark jumps not in the spark plug, but at the coil contacts, as if the cap was removed
I meant when using coils from a car without spark gaps on the coils..
manowar
Sergeant is right - on an electronic one you can safely set 1-1.3 mm instead of the prescribed 0.6
7Joker
for serjant
: Ahh.. then maybe.
john95
Just install a 6 Volt coil and everything will be fine, I installed it in the Urals last season and there were no problems with spark or ignition, and at the same time it starts with one poke.
Wild
At 6 volts you can’t drive for long if the generator is good then at high speeds it will burn out!!!!!
gering
Capacitor - may well be the cause of a bad spark, because in the standard circuit it is an accelerating one, and if it is present, the speed of the self-induction process is reduced, and the pulse current increases - the spark becomes more powerful.
and there can be just a lot of glitches in Conders - change them and check them. The original Ural coils are generally a HIGH-VOLTAGE DISGRACE - change them at the first possible opportunity - my version is an Okovskaya coil in series with a variator - it has been working for 5 years. john95
quote:
You can’t drive for long at 6 volts; if the generator is good, it’ll burn out at high speeds!!!!!
I wrote that I drove it for a whole season and never messed with the ignition or carbs, the generator is new and standard.
Wylde
In Moto (number 6, it seems) they wrote that if you put two six-volt coils from the same Izhak instead of one opposed one, the spark will be noticeably better... I haven’t tried it myself, yet...
AVSRLS
Gentlemen Oppositors! You all argue and argue... If the spark is weak, especially since the operation of the engine, as I understand it, confirms this, then this indicates a malfunction of something. The faults have already been listed above, there is nothing new here. But as for what to install - IMHO, ONLY DESIGNED (not necessarily native) parts for a given design. If everything is in order (in general, everything on the moto) - it will work like a Swiss watch! No need to get fancy with coils from other models, etc. You should not install a 6-volt coil instead of a 12-volt one. It is necessary to eliminate the CAUSE, and not fight its consequences. So, by the way: I have everything original (I just want to replace the ignition with an electric one soon) and my device always starts, even at minus 20.
With respect to everyone... Good luck to you!
Carburetor problems
So, you are the owner of a Minsk motorcycle, the carburetor of which regularly receives gasoline, and the spark plug provides a spark sufficient for stable operation of the engine.
But this is not enough for the motorcycle to start. An unscrewed dry spark plug showed that the problem was in the carburetor, namely, the incoming fuel could not reach the combustion chamber of the cylinder. In this case, it is necessary to remove and clean the carburetor.
To clean the carburetor, it must be removed by disconnecting it from the cylinder and air filter. You also need to disconnect the throttle cable and gasoline hose. To prevent dirt from getting inside the carburetor, before further disassembly you must not be lazy and completely clean it.
It is necessary to disassemble and reassemble the carburetor cleanly, since dust or dirt particles getting inside will lead to unsatisfactory operation of the motorcycle engine even after washing it.
Upon completion of disassembling the carburetor, it is necessary to clean all its parts from accumulated dirt, and also blow out all channels and the jet with a compressor. It will not be superfluous if you additionally blow out the air filter and gas tap.
After completing all the manipulations, you need to install the carburetor in place. During assembly, as well as during disassembly, it is necessary that no dirt gets inside the carburetor.
After installation, make sure that the carburetor fits tightly to the cylinder. If you did everything correctly, you can be sure that after some effort your Minsk motorcycle will be able to start.
