ATV Troubleshooting Guide
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Engine
turns over but does not start |
No
Fuel
Dirt in fuel line or fuel filter
Fuel will not pass through on-off valve (petcock)
Fuel tank vent plugged
Carburetor starter circuit
Engine flooded
Low compression
No spark
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Add
fuel as required
Clean or replace valve as necessary
Repair vent system
Clean or replace as needed
Turn off fuel and drain crankcase
A) Inspect carburator venting system for blockage
B) Inspect carburator needle and seat
C) Inpect head gasket
D) Inspect piston and cylinder, repair as required
Check for proper spark plug connection
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Engine
does not turn over |
Dead
Battery
Starter motor does not turn
Engine stuck or froze
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Change
or replace battery
Repair or replace starter motor
Repair engine as required
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Engine
runs but will not idle |
Plugged
carburetor pilot system
Carburetor improperly adjusted
Low compression
Crankcase leak
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Clean
or replace pilot jet<
Adjust carburetor per specifications
Adjust choke per specifications
Repair engine as required
Repair or replace crankcase as required
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Engine
runs but will not rev up |
Broken
throttle cable
Obstructed air intake
Incorrect carburetor jetting
Incorrect ignition timing
Restricted exhaust system
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Replace
throttle cable
Clean or repair air intake, replace air filter
Jet as per jetting chart for carburetor
Check and adjust ignition timing
Repair, clean or replace exhaust system
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Engine
has low power |
Cylinder,
piston and ring wear or damaged
PVT not working properly
Restricted or blocked exhaust
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Perform
compression check
Clean, repair or replace as needed
Repair, clean or replace exhaust system
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Piston
scoring |
Lack
of lubrication
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Fill
oil tank and bleed oil pump
Check oil pump for proper operation or restricted
vent line
Restricted oil delivery
Oil pump drive gear failure
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Melted
Piston top |
Engine
overheating
Lean air fuel ration
Air leak in crankcase
Incorrect ignition timing
Incorrect spark plug
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Low
coolent level in radiator (liquid cooled)
Restricted cooling fins (air cooled)
Clean carburetor and jets
Repair as needed
Adjust timing per specification
Install correct spark plug
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Broken
piston skirt |
Piston
fatigue from scoring
Excessive piston to cylinder clearance
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Repair or replace cylinder and piston
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Excessive
smoke and carbon build up |
Oil
pump not adjusted properly
Oil pump cable not allowing pump to return to idle
position
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Synchronize
pump to carburetor
Lubricate or replace cable
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Engine
coolent found in counter balance assembly |
Water
pump gasket
Water pump seals
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Replace
water pump gasket
Replace water pump seals
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Blown
engine |
Skirt
broken off piston, hole in crankcase
Bearings on counter balance shaft failed
Engine stuck or froze
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Both
result in engine not running, full compression. No
crankcase pressure, which is needed for 2 stroke engine
Replace crankcase and other related parts
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