Maintenance & Technical > KX500 Original

Piston oversize and compression

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sdkx500:
I have a couple of questions.

1.  When taking top end compression do u take it with the bike warm or cold

2.  Has anybody used the prox kits.  At what point do u go to the +.01mm oversize?

Thanks for the info.

T

sdkx500:
Dumb question?   :oops:

kawdude:
I believe compression is done cold.  Why do you want to go to the oversize?  I went 2mm over for the bigbore.

gowen:
Nope! Sorry, I believe you can take a compression test while the bike is cold, I've always done that, maybe I was wrong.

Also, proX I hear are like stock, cast and about the same, nothing special. I would keep to the standard size until you get piston slap. Maybe that is bad advice, but I would not move to any oversized pistons unless you get it bored for correct specifications.

gowen:
ahh, beat me to it Kawdude.. :-)

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