raptor piston
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raptor piston
i bore cylinders all the time from 2 to 4 strokes. i have done alot of raptors mostly 690's we only use JE pistons. the cylinder to piston clearance is a few thousands of an inch and if its too much you will get piston slap and it will break a piston. if i were you i would talk to the shop who bored your cylinder and mic cylinder and piston if still half together.
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