ENGINE
2.29
TROUBLESHOOTING, CONT
Excessive Smoke and Carbon Buildup
S
Excessive piston-to-cylinder clearance
S
Worn rings, piston, or cylinder
S
Air filter dirty or contaminated
Low Compression
S
Cylinder head gasket leak
S
Cylinder or piston worn
S
Piston rings worn, leaking, broken, or sticking
Backfiring
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 Lean condition
Overheating
S Lean mixture (restricted jets, vents, or fuel valve)
S Dirt in cooling fins
S Ignition timing misadjusted
S Spark plug incorrect heat range
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