Polaris Sportsman 400 Service Manual page 148

TROUBLESHOOTING, CONT
Excessive Smoke and Carbon Buildup
S Excessive piston-to-cylinder clearance
S Wet sumping
S Worn rings, piston, or cylinder
S
Worn valve guides or seals
S Restricted breather
S Air filter dirty or contaminated
Low Compression
S Decompressor stuck
S Cylinder head gasket leak
S
No valve clearance or incorrectly adjusted
S Cylinder or piston worn
S Piston rings worn, leaking, broken, or sticking
S
Bent valve or stuck valve
S Valve spring broken or weak
S
Valve not seating properly (bent or carbon accumulated on sealing surface)
S Rocker arm sticking
Backfiring
S ETC or speed limiter system malfunction
S Fouled spark plug or incorrect plug or plug gap
S Carburetion faulty - lean condition
S
Exhaust system air leaks
S
Ignition system faulty:
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
S Poor connections in ignition system
S System wiring wet
S
Valve sticking
S
Air leaks in intake
S Lean condition
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ENGINE
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