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Dirt Bike Brands - Other
Lower compression when hot?
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[QUOTE="KX_OUTLAW, post: 1383287, member: 119129"] can't reply, says spam killer detects something in my post. It's text only, there are no links Let me clarify. The first cylinder was bored, ported, and plated. It was bought in kit form and the clearances were all set by the builder, and I double checked. New ring end gap was .014 iirc. It ran fine. It had to be replaced due to external damage. It had enough run time to burn 1 gal of fuel. I did a comp check on it and pulled it. There were about five 1/8" wide up and down wear marks in the bore. The piston looked brand new still, no rub on the piston. Both set up for pump gas, high rpm, and it does not ping (aka detonate/preignition, etc) New cylinder, same builder ported, bored, plated it. Used the same piston as advised. Replaced rings, and gaskets with same as before except new. Ring gap .012. Same tank of gas to break it in, as of now it's burned approx a gallon. Compression test is slightly lower but it runs noticably better. I could see maybe the oil viscosity would be thicker when cold and produce more compression during testing cold. I always let it warm up before riding. I guess I just read too much. Maybe nevermind I don't know. [/QUOTE]
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Dirt Bike Brands - Other
Lower compression when hot?
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