2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 449Get this manual
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MAINTENANCE SPECIFICATIONS Model Piston ring: Sectional sketch Top ring Ring type Dimensions (B 2nd ring Ring type Dimensions (B Oil ring T) Taper 0.8 2.8 mm (0.031 0.110 in) T) Barrel 0.90 2.75 mm (0