Maintenance & Technical > KX500 Original

Piston oversize and compression

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mikesmith:
You can always contact Pro-X and get it from the horses mouth!There are no dumb questions,only the ones you dont ask!I wonder on a compression test cold because every thing expands to size as it warms up,but then you need compression to get the bike to start.So Id say cold to,but thats someting to think about.

sdkx500:
Cool thanks for the input .  I will run one cold and see if im within limits.  No slap I was just reading and found the barely oversize piston which said it was for mildly worn plated cylinders.

Thanks again

kawdude:
Yeah pro-x has numerous "halfsizes" for worn plating.  Contact Forward Motion and see what they can do for replating and piston...excluding the porting.

teamgreen500:
Get your motor torn down and take the measurements as indicated in the manual. The gap or 'Difference' between your cylinder and piston determines what "size" piston you need.

Get this! Johnny, at Kawasaki/Team Green says run a piston as long as it mic's out well. They become "seasoned" and can last virtually FOREVER; However, "Wear" is key! If you're really concerned about this, you can have a good "tuner" or "Engine Builder" measure this for you and advise you as to which piston is right for you.

Good luck and Speed Safely!

Manny

sdkx500:
Manny Do you just keep slapping new rings in periodically?  I just get worried cuz my 250's always went through pistons and the big green seems to last forever

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