Quote:
Originally Posted by joedoozer
Don't get to bent out of shape about them being 72cc. 10;1 is the magic number for street use. If it is daily driver, and pump gas only. You will be glad you have the 72cc. A decent flat top piston with 2 valve reliefs and it should get you real close to 10:1, might even put you just over. Anything more than that and you end up running octane booster or mixing your fuel; 92 with some racing fuel. I didn't want to be hassled with that stuff on a daily driver. But it all depends on what you think is a hassle haha.
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That's a negative. A flat-top piston with a standard .028" head gasket thickness and a 72cc combustion chamber is 8.75:1.......... if you drop to a .015" head gasket you can get 9.25:1 but then you run the risk of a blown head gasket the first time you overheat the engine.