2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 34Get this manual

2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 34

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COMPRESSION PRESSURE MEASUREMENT ENGINE OIL LEVEL INSPECTION
To prevent sparking, ground all spark plug leads before cranking the engineNOTE: The difference in compression pressure between cylin