Filter
Top Products
ENGINE
3.44
TROUBLESHOOTING
Engine Turns Over But Fails to Start
G No fuel
G Dirt in fuel line or filter
G Fuel will not pass through fuel valve
G Fuel pump inoperative/restricted
G Tank vent plugged
G Carb starter circuit
G Engine flooded
G Low compression (high cylinder
leakage)
G No spark (Spark plug fouled)
Engine Does Not Turn Over
G Dead battery
G Starter motor does not turn
G Engine seized, rusted, or
mechanical failure
Engine Runs But Will Not Idle
G Restricted carburetor pilot system
G Carburetor misadjusted
G Choke not adjusted properly
G Low compression
G Crankcase breather restricted
Engine Idles But Will Not Rev Up
G Spark plug fouled/weak spark
G Broken throttle cable
G Obstruction in air intake
G Air box removed (reinstall all intake
components)
G Incorrect or restricted carburetor jetting
G ETC switch limiting speed
G Reverse speed limiter limiting speed
G Carburetor vacuum slide
sticking/diaphragm damaged
G Incorrect ignition timing
G Restricted exhaust system
Engine Has Low Power
G Spark plug fouled
G Cylinder, piston, ring, or valve wear or
damage (check compression)
G PVT not operating properly
G Restricted exhaust muffler
G Carburetor vacuum slide
sticking/diaphragm damaged
G Dirty carburetor
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 Wet sumping
G Worn rings, piston, or cylinder
G Worn valve 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 Piston rings worn, leaking, broken, or
sticking
G Bent valve or stuck valve
G Valvespringbrokenorweak
G Valve not seating properly (bent or
carbon accumulated on sealing surface)
G Rocker arm sticking
Backfiring
G ETC or speed limiter system malfunction
G Fouled spark plug or incorrect plug or
plug gap
G Carburetion faulty - lean condition
G Exhaust system air leaks
G Ignition system faulty:
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
G Poor connections in ignition system
G System wiring wet
G Valve sticking
G Air leaks in intake
G Lean condition
Enfocus Software - Customer Support