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

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

ENGINE Low Compression No valve clearance Valve not seating properly (bent valve or carbondebris accumulated on sealing surface)
Valve spring broken or weak Rocker arm sticking Backfiring Fouled spark plug or incorrect plug or plug gap Speed limiter
system malfunction Exhaust system air leaks Ignition system faulty: Spark plug cap crackedbroken Ignition coil faulty Ignition