2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 148Get this manual

2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 148

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CYLINDER AND PISTON
Bore "C" 74.00074.016 mm (2.91342.9140 in) Wear limit 74.100 mm (2.9173 in) "C"maximum of D1D6 bIf out of specification, rebore or replace the cylinder, and replace the pisto