Maintenance & Technical > KX500 Original

Bike won't start!

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bob larry:
There is very low compression on the kickstart....can push it with my hand!

Motor just stopped running....

I guess it is the piston and ring.   Anything else it could be.

I am going to tear it all apart tonight, am looking for some ideas.
I am armed with the sticky top end write up which is A+ .

DoldGuy:
Bob,
Investigate why it has low compression before tearing the motor apart (leak Down test, dirt thru the filter, etc.) or you may be visiting this topic again after a fresh topend.
DoldGuy

bob larry:
Dirt through the filter will lower the compression?

Going to look up how to do a leak down test......

Thanks for the help........keep er coming
sucks when they are down and out

Hillclimb#42:
Yep. Dirt thru the filter = dirt sanding on the rings. Leaning it out will also melt them. Most likely are looking at piston and ring top end do-over,  :lol: and hopefully no damage to cylinder, keep the fingers crossed and the lucky rabbits foot in your pocket, :-D. Yeah that sucks when they are down even worse when you find it was from something preventable. Live and learn on those deals. that could be a whole thread by itself
  HOW SOMETHING SO SIMPLE MELTED DOWN MY MOTOR... I would have a few stories of my own to confess...

bob larry:
Well it was the rings....I am amazed these motors will run right till there is NO ring left.

So it is bottom and top end time.....

Any suggestions would be awsome.....
Anybody on here fix the whole shabam..

Will send the jug out and get the piston kit.

The bottom end I will need bearings and seals.

DOE!
looks like I'm out for a bit... :? :?

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