Maintenance & Technical > KX500 Original
KX500 Wont Start!!!!
Johnniespeed:
If you have a friend with a quad, try to pull start it. I submerged a cr250 completely under water. Took about fifty feet of pull starting to get it to fire up.( yes I dried out the air box first.)
The fuel is known good?
The spark is known good?
The compression is known good?
I am sure you are getting tired of the same old questions from everyone, but good compression at the right time, good spark at the right time and the right amount of fuel in the combustion chamber at the right time. IT SHOULD RUN.
John
cbxracer30:
My 5 has a 44tron and sometimes the floats stick and floods the cylinder. When this happens it won't start and I have to turn off the fuel, remove the spark plug, put the bike in gear and either just push it around or pull it a bit behind quad -in gear- then put the plug back in and it fires right up. then turn the gas back on.
KXcam22:
cass,
Is your plug wet or dry after you try to start it multiple times? It is possible that it is the CDI. Sometimes they fail weird before they die outright. I once had one go (non KX) under your circumstances - after a rebuild. As I was breaking it in on a slow trail ride the bike began seizing repeatedly. It took about 7 or 8 seizures before I got back to the truck then it wouldn't start, which I attributed to the multiple seizures. In my shop I found no spark then tested the cdi which proved to be bad. Last thing I suspected - I was expecting an air leak.
If you are putting gas down the plug hole and it still doens't fire then there is either, no spark, no compression, or spark at wrong time. Those are the only 3 possibilities. Sounds like you have ruled out the first two so is has to be the third, "spark at wrong time". That can only be sheared flywheel key, damaged impulse pickup, or bad CDI. You have ruled out one of these so it could be, "damaged impulse pickup" or "bad CDI". An ohm meter should verify the pickup (you might have already done this) - you can have heat issues with pickup failures but that is not the case here. Sounds like "bad CD" is the winner.
Heres some suggestions:
1. CDIs arn't cheap. It would be nice to borrow a cdi and try it -but hard to find.
2. Try kicking it over with a timing light on the flywheel to see if it fires at the mark.
Hope this helps. Cam.
Hillclimb#42:
I would still want to check reeds. It seems like it would do something with fuel poured right in there, but might have to be right mixture to kick. Also, another way over obvious suggestion/question, did you swap plug out? Could have been a bad plug that you recently put in. Try not to eliminate things completely, because you already checked. Also, check jets in carb for debris, petcock for flow,
kxpegger:
Check the kill switch.
A buddy of mine replaced many parts including the CDI module just to find out that his kill switch was bad. His was an intermittent problem. Once the bike died the vibration would stop and the bike would usually start again. Sometimes he could ride for hours before the kill switch would act up.
The symptoms you describe don't really point to the kill switch but it may be worth a try and a cheap fix.
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