2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 33Get this manual

2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 33

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COMPRESSION PRESSURE MEASUREMENT
Insufficient compression pressure will result in loss of performance1 Measure: Valve clearance Out of specification AdjustRefer to "VALVE CLEARANCE ADJUSTMENT"2