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Yz100 -80 Cylinder clearance

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Hello ive got a Yamaha Yz100 from 80 and i am going to bore the cylinder to replace the piston with an over dimension one (0.25 bigger) 

The thing i need to know is how much clearance it should be between cylinder and piston. Going to hand it over to a machine shop but would suck if i guess a clearnce number and the motor seize from heat or something. Anybody here know what the clearance should be on this engine? 

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