Maintenance & Technical > KX500 Original

1985 kx500 popping sound???

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outlaw:
I race cage karts and I have a 1985 kx500. during the last race i broke a ground wire. motor popped a few times when it broke then got back to the pits and fixed the ground wire and went out for the next race and the car would idle fine but once you started to get on the throttle the car would cut out and fall on its face and pop a little. So we loaded up and brought it home. replaced coil and still having problem. took it to a kawasaki mechanic and he tested the coil, and the stator and both were perfect. tried firing it up again and again it would idle but once you give it throttle it would fall on its face and pop really loud then the motor would die. now the motor wont fire at all just pops.......there isnt much fuel in the bowl of the fuel filter so were going to replace the fuel pump and replace the ground wire because it looks a little rough. anyone got any ideas what could be my problem??? :?

DoldGuy:
Sounds like a sheared flywheel key.
DoldGuy

outlaw:
When we pulled the flywheel off to take a look at the stator the flywheel key was perfect. no damadge to it at all...

DoldGuy:
Have you put a timing light on it to see whats happening with the advance?

Friar-Tuck:
Hey Outlaw,
  (Sorry Gold, I couldn't type this fast enough! checked the woodruff key)
 
I think I would pull the carb and verify the fuel/float level.  While the carb is off pull the reed block and have a look for cracks or chips.

 Make sure the fuel pump wasn't damaged and verify it works, (it is an impulse pump correct?)
 Check the Fuel line and vents are clear.
   If that all checked out, I'd look for good spark, the cap and plug wire look O.K.? 
  Then the kill switch,  and then  check the timing.
Whew!
  Hopefully one of the guys will recognize your symptoms and say "Oh yea that happened to me"
     Hang in there!
 Tuck\o/

 

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