ENGINE
3.47
TROUBLESHOOTING
Piston Failure - Scoring
G Lack of lubrication
G Dirt entering engine through cracks
in air filter or ducts
G Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
G Excessive piston-to-cylinder
clearance
G Worn rings, piston, or cylinder
G Worn valves, guides or seals
G Restricted breather
G Air filter dirty or contaminated
Low Compression
G Decompressor stuck
G Cylinder head gasket leak
G No valve clearance or incorrectly
adjusted
G Cylinder or piston worn
G Pistonringsworn,leaking, broken,or
sticking
G Bent valve or stuck valve
G Valvespringbrokenorweak
G Valve not seating properly (bent or
carbon accumulated on valve area)
G Rocker arm sticking
Backfiring
G ETC or speed limiter system
malfunction
G Fouledsparkplugorincorrect plugor
plug gap
G Carburetion faulty - lean condition
G Intake / Exhaust system air leaks
G Ignition system faulty:
GSpark plug cap cracked/broken
GIgnition coil faulty
GIgnition or kill switch circuit
faulty
GIgnition timing incorrect
GSheared flywheel key
G Poor connections in ignition system
G System wiring wet
G Cam lobe worn or Valve sticking
G Lean condition
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