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Yamaha 4stroke rebuild troubles

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hey guys, i just got done putting a new top end on my grandpas 1986 yamaha moto 4 225. I got everything put back together and it fired right up! I was so happy because its my first 4stoke rebuild...that didn't last long. I noticed that there was a substantial amount of oil leaking out of the base of the cyllinder. I put brand new gaskets in the whole top end but the base gasket still leaks. The cyllinder bolts are torqued down all the way. I'm stumped...anyone have any clues? thanks

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did u remeber to clean the old gasket off and any other debris it sound stupid but that could be it

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