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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
stock 125 compression readings (PSI)?
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[QUOTE="xERICx, post: 710476, member: 39092"] I finally did my first top end. The compression before the top end was 167psi. After breaking in the top end and riding it under 1/2 throttle for about 20 minutes I get a reading of 180psi. What range should a stock 125 be? Bike is a 2001 KX125. Also, after a rebuild when is the best time to do a compression test? Does it matter if I do one at 20 minutes or will the top end need to be broken in further to get a more accurate reading. This has been buggin me for a couple days now. I thought that this bike had a modified head or cylinder (higher compression) but the guy who sold me the bike said he ran pump gas. I do know that the bike was ported, and the company that did it has machined there name into the side I talked to the company that ported it and they could not tell me anything about the motor, they just knew that they ported it. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
stock 125 compression readings (PSI)?
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