April 20, 201016 yr just changed mains and crank seals and noticed there is a bit of a clunk when you spin the sprocket cog anything i can do b4 i put the rest of the engine together cheers mick i think its called the output shaft if you rotate it eitherway fast it gives a clunk it did it when i rode the bike complete a touch of throttle and it was like the chain slapping at least thats what i thought untill i split the engine Edited April 21, 201016 yr by skippy1234
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