2001 Yamaha YFM660 Raptor Factory Service Manual, Page 323Get this manual

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 323

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STARTING FAILUREHARD STARTINGPOOR IDLE SPEED PERFORMANCEPOOR MEDIUM AND HIGH-SPEED PERFORMANCE COMPRESSION SYSTEM Cylinder and cylinder head Loose spark plug Loose cylinder head or cylinder Broken cyl