Question about kawasaki KX 500 Motorcycles

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My 86' Kawasaki KX 500 won't start.

I rebuilt an 86' Kawasaki KX 500 Motocrosser and after re-assembly I have a fairly weak spark. It does not start and backfires on about every 5th kick. The spark plug is wet. I have moved the stator to every position possible and the stator, coil, ground, and kill switch test ok.I'm not sure if there is a reliable way to test the black box. Compression is good, air box clear and the pipe is open.The engine has new seals. The carb. is clean. Any thoughts? David C.

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Posted on Jan 02, 2017

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SOURCE: wont run...

Any water in the gas? Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Get a fresh set of stock NGK spark plugs. Clean or replace the air filter. You seem to be pretty thorough in what you have done, but since plugs and filter weren't mentioned I had to ask.

Assuming you are getting air, gas and spark, and the timing is correct then it should run. Right? Not necessarily. Can the bike breathe? If pressure cant get out of the tailpipe the bike won't run. Mufflers can sometimes collapse internally. This restricts the flow of burned gasses. causing backpressure. If nothing goes out of the cylinder then nothing goes in.

Try removing the exhaust pipes. Now see if it will run. Get back to me because I would like to know what you find.

Posted on Mar 29, 2009

  • 6 Answers

SOURCE: honda cbr 600 wont start

hi, each lead has the specific number on it. if you do this correctly then they genrally give you an idea to where the sit in the coils( the way they bend :-) ) also i believe the coils are better off been attached to the frame once you are sure leads are in corect order and possitioned correctly in the coils.i just presumed the coils neaded earthing. make sure battery is pleny charged as a bad battery can just hinder. it is also very easy to flood the bike so just check the plugs again. if they are unusually wet then dry them off and try again . otherwise maybe try cleaning all electics.

hope this somehow helped
gavin barraclough

Posted on Apr 26, 2009

  • 1 Answer

SOURCE: can't keep running seems to flood out 1978/79 kawasaki

seems your fuel to air mixture is wrong

Posted on May 13, 2009

  • 1689 Answers

SOURCE: i have a kawasaki kx 250 2 stroke an it was

hi murray,

nice bike you have there.

have you checked on the carb ans see if the jet is right and the mixture is normal, this is usually the case if the carb is not tuned right.

better of reset the card, open it clean it, then set to default even if you are using your mixture of gas and 2t. just set to factory default. once it starts give it a few run, 1-2 hours, then set it to how you want your mixture to be.

hope this helps,



Posted on May 17, 2009

  • 6966 Answers


Hi and welcome to FixYa,

Initially, test for the presence / absence of below described voltages using an analog / needle type voltmeter when starting the bike:

  • pulsating low AC voltage coming from the pickup coil;
  • pulsating voltage feeding the ignition coil.

Good luck and thank you for asking FixYa.

Posted on Dec 19, 2009

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you can try

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