Maintenance & Technical > KX500 Original

ignition problems

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dcollins4328:
I have a 1993 kx 500.  It started fine and ran for several hours, them, it would'nt make enough of a spark to run, it would only backfire.  I replaced the cdi and ignition coil on the stator.  It ran fine for several hours, then slowly lost voltagge or something, and eventually it wouldn't run?  I am frustrated, any help would be apprieciated.

MadKaw:
check timing?

KXcam22:
dc,
  Sounds suspiciously like a sheared flywheel key.  When you replaced the ignition coil are you talking the stator inside or the timing pickup coil. Did you remove the flywheel to do this?  Also try disconnecting the kill switch as they can fail closed (grounded) sometimes.  Let me know. Cam.

dcollins4328:
I replaced the ignition coil on the stator plate with a moose coil.  I had to remove the flywheel to do this.  I also replaced the woodruff key, so i know that's not what it is, and I sodered the wires together.  It will make a spark;when I pull the plug out of the cylinder and kick the bike over, I can feel the spark with my hands, but it is weak.  How do you change/adjust the timing?

hughes:

--- Quote from: dcollins4328 on March 29, 2007, 05:47:38 PM ---I replaced the ignition coil on the stator plate with a moose coil.  I had to remove the flywheel to do this.  I also replaced the woodruff key, so i know that's not what it is, and I sodered the wires together.  It will make a spark;when I pull the plug out of the cylinder and kick the bike over, I can feel the spark with my hands, but it is weak.  How do you change/adjust the timing?

--- End quote ---

Have you removed the flywheel to check the key? The flywheel and the crank shaft are a tapered fit. Dirt,grease,oils will keep the tapers from locking together. The key is just a way to aline the flywheel. The locking tapers is what keeps the flywheel from spinning on the crank.

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