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SKU 65414
engine troubleshooting
Problem: Low power output. Engine bogs down or stops under load. Excess exhaust or
unburned fuel in exhaust. See chart below:
engine system
possible cause
possible solution
Ignition System
Incorrect Ignition Timing
Adjust Engine Advance Angle
Fuel Supply System
Air in fuel line or fuel line clogged.
1.
Main Jet not adjusted properly.
2.
Metering Jet or Main Jet clogged
3.
Fuel Cock clogged
4.
Carbon Fouling in Combustion
5.
Chamber
Clogged Air Filter
6.
Intake Manifold leaking.
7.
Remove air or clear obstruction.
1.
Readjust Main Jet.
2.
Clean and Readjust.
3.
Clean or replace as needed.
4.
Clean out Combustion Chamber
5.
and Manifolds.
Clean or replace Air Filter.
6.
Repair or replace as needed.
7.
Poor Compression
Worn Piston, Piston Ring or
1.
Cylinder Wall.
Leaking Cylinder Head Gasket.
2.
Worn Valves, Valve Seats, Stems
3.
or Valve Guides.
Check compression and wear
1.
tolerances, repair or replace as
needed.
Check compression, replace as
2.
needed.
Check wear tolerances, repair or
3.
replace as needed.
Problem: Engine does not start or does not run smoothly. See chart below:
Symptom
Possible Cause
Possible Solution
Engine is Pinging
Excess wear of Piston, Cylinder
1.
Wall or Rings.
Excess wear of Piston Pin or
2.
Piston Pin Hole
Excess wear of Tie Rod small
3.
end
Excess wear of Crankshaft Roller
4.
Bearing.
Check wear, replace as needed.
1.
Check wear, replace as needed.
2.
Check wear, replace as needed.
3.
Check wear, replace as needed.
4.
Abnormal Com-
bustion or engine
running hot or
excess smoking.
Combustion chamber carbon
1.
fouling.
Dirty or old gasoline or oil in gas.
2.
Clean out Combustion chamber and
1.
spark plug.
Drain gas, clean out fuel filter and
2.
replace with fresh gas, minimum
octane 87.
Engine does not
start.
Engine Switch in OFF position.
1.
Water in Carburetor Bowl.
2.
Spark Plug gap damaged or not
3.
set properly.
Incorrect Ignition Timing.
4.
Damaged coil or ignition wires.
5.
Low Oil level.
6.
Move Switch to ON position.
1.
Drain carburetor Bowl, clean Fuel
2.
Filter.
Clean and re-gap plug at 0.030”.
3.
Replace plug if needed.
Check timing and adjust.
4.
Check for damaged wires, test output.
5.
Check oil level, top off as needed.
6.
