2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 153Get this manual

2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 153

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ENGINE Low Compression

Backfiring
Fouled spark plug or incorrect plug or plug gap Speed limiter system malfunction Exhaust system air leaks Ignition system faulty: Spark plug cap cr