2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 33Get this manual

2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 33

COMPRESSION PRESSURE MEASUREMENT CAUTION: INSP ADJ Before removing the spark plugs, use compressed air to blow away any dirt
few drops of oil into the affected cylinder and measure againRefer to the following tableCompression pressure (with oil applied
into cylinder) Reading Higher than without oil Diagnosis Piston ring(-s) wear or damageRepairPiston, valves, cylinder head
gasket or piston possibly defectiveRepairCompression pressure (at sea level) Same as without oil Compression pressure (at
sea level): Standard: 1,450 kPa (14.5 kgcm2, 206 psi) at 400 rmin Minimum: 1,260 kPa (12.6 kgcm2, 179 psi) at 400 rmin Maximum: