Maintenance & Technical > KX500 Original

KX500 COMPRESSION LOSS

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hughes:

--- Quote from: monster malibu on July 21, 2007, 06:08:25 AM --- If the piston and jug looks ok will I be able to put a new ring on and go? Where do I order a piston and ring for my 87? I've checked Dennis Kirk, Rocky Mountain, MotoSport, and Bob's cycle supply for a new piston and ring for my 87 and they only list 88-up. Will the 88-up piston with two rings fit my 87?

--- End quote ---

88-04 piston and rings work great. Same piston kaw just added a second ring to the newer piston. wrist pin and bearing are the same so are the circlips. Sounds like you stuck a piston if it stalled and you could not crank it over but after it cooled down it cranks over.

monster malibu:
Thanks for the info guys. Hey hughes I think you miss understood me. When the bike stalled I was able to roll the motor over easily by hand, I forgot to check the coolant. 

monster malibu:
Well I finally checked my bikes compression today and it was 55lbs. I checked it 3 times and all the readings were the same. Time to tear off the top end, hopefully the jug and head is ok.

hughes:
That sucks. Keep us posted.

monster malibu:
I "finally" got the topend off my bike and the piston was bad. The previous owner said I shouldv'e rejetted after adding the Moose torque spacer, he said it was running lean. The cylinder has a little aluminum in it, I was told to clean it up with some muric acid. The new piston is on the way and I can't wait to ride!!

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