2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 203Get this manual

2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 203

CRANKCASE 2nd step: Measure piston skirt diameter "P" with the micrometera mm (0.20 in) from the bottom edge of the pistonPiston
"C" Piston skirt diameter "P" Piston-to-cylinder clearance: 0.030 0.055 mm (0.0012 0.0022 in) Limit: 0.12 mm (0.0047 in)
If out of specification, replace the cylinder, and the piston and piston rings as set 3Measure: Side clearance (piston rings)
Use the thickness gauge Out of specificationReplace the piston and piston rings as setNOTE: Eliminate the carbon deposits