2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 152Get this manual

2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 152

ENGINE TROUBLESHOOTING Engine Spark Plug Fouling Restricted air filter (main or pre-cleaner) or breather system Improperly
or damage (check compression) PVT not operating properly Restricted exhaust muffler Camshaft worn excessively Engine Turns
Over But Fails To Start No fuel Dirt in fuel line, filter, or injectors Fuel pump inoperativerestricted Fuel valve off or
restricted flow Tank vent plugged or pinched Engine flooded Low compression (high cylinder leakage) No CPS signal (debris
on CPS pole, damaged CPS causing incorrect air gap) No spark (spark plug fouled) ignition component failure Piston FailureScoring
Lack of lubrication Dirt entering engine through cracks in air filter or ducts Engine oil dirty or contaminated (water) Excessive
Smoke and Carbon Buildup Excessive piston-to-cylinder clearance Worn rings, piston, or cylinder Worn valve guides or seals
Restricted breather Air filter dirty or contaminated Engine Does Not Turn Over Dead battery Starter motor does not turn Engine