Spark Plug Fouling Checklist; Troubleshooting - Polaris RANGER 2x4 Manual

SPARK PLUG FOULING
S
Spark plug cap loose or faulty
S
Choke cable
plunger/cable sticking
S
Foreign material on choke plunger
seat or plunger
S
Incorrect spark plug heat range or
gap
S
Carburetor inlet needle and seat
worn
S
Jet needle and/or needle jet worn or
improperly adjusted
S
Excessive carburetor
(loose or missing needle jet locating
pins)
S
Loose jets in carburetor or calibration
incorrect for altitude/temperature
S
Incorrect float level setting
S
PVT system calibrated incorrectly or
components worn or mis-adjusted
S
Fuel quality poor (old) or octane too
high
S
Low compression
S
Restricted exhaust
S
Weak ignition (loose coil ground,
faulty coil, stator, or ETC switch)
S
ETC switch mis-adjusted
S
Restricted air
pre-cleaner) or breather system
S
Improperly assembled air intake
system
S
Restricted engine breather system
S
Oil contaminated with fuel
S
Restricted oil tank vent

TROUBLESHOOTING

Engine Turns Over But Fails to Start
S
No fuel
S
Dirt in fuel line or filter
S
Fuel will not pass through fuel valve
S
Fuel pump inoperative/restricted
S
Tank vent plugged
S
Carb starter circuit
S
Engine flooded
S
Low compression (high cylinder
leakage)
S
No spark (Spark plug fouled)
Engine Does Not Turn Over
adjustment or
vibration
filter (main or
S
Dead battery
S
Starter motor does not turn
S
Engine seized,
mechanical failure
Engine Runs But Will Not Idle
S
Restricted carburetor pilot system
S
Carburetor misadjusted
S
Choke not adjusted properly
S
Low compression
S
Crankcase breather restricted
Engine Idles But Will Not Rev Up
S
Spark plug fouled/weak spark
S
Broken throttle cable
S
Obstruction in air intake
S
Air box removed (reinstall all intake
components)
S
Incorrect or restricted carburetor jetting
S
ETC switch limiting speed
S
Reverse speed limiter limiting speed
S
Carburetor
sticking/diaphragm damaged
S
Incorrect ignition timing
S
Restricted exhaust system
Engine Has Low Power
S
Spark plug fouled
S
Cylinder, piston, ring, or valve wear or
damage (check compression)
S
PVT not operating properly
S
Restricted exhaust muffler
S
Carburetor
sticking/diaphragm damaged
S
Dirty carburetor
Piston Failure - Scoring
S
Lack of lubrication
S
Dirt entering engine through cracks in air
filter or ducts
S
Engine oil dirty or contaminated
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
ENGINE
rusted, or
vacuum slide
vacuum slide
3.53