2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 104Get this manual
ENGINE Cylinder head gasket leak No valve clearance or incorrectly adjusted Cylinder or piston worn Piston rings worn, leaking, broken, or sticking Bent valve or stuck valve Valve spring broken or weak Valve not seating properly (bent or carbon accumulated on sealing surface) Rocker arm sticking Backfiring ETC or speed limiter system malfunction Fouled spark plug or incorrect plug or plug gap Carburetion faultylean condition Exhaust system air leaks Ignition system faulty: Spark plug cap crackedbroken Ignition coil faulty Ignition or kill switch circuit faulty Ignition timing incorrect Sheared flywheel key Poor connections in ignition system System wiring wet Valve sticking Air leaks in intake Lean condition Ignition timing misadjusted Low oil level Spark plug incorrect heat range Faulty hot light circuit Thermostat stuck closed or not opening completely Temperature Too Low Thermostat stuck open Leak at Water Pump Weep Hole Faulty water pump mechanical seal (coolant leak) Faulty pump shaft oil seal (oil leak) S