Instruction manual

Engine
1.Won't start
Troubleshooting
Fuel is present
but the spark plug
is not sparking.
Fuel and spark
are both present.
Fuel is not being
supplied to the
carburetor.
Electricity is being
supplied to the
high voltage
cable.
Electricity is not
being supplied to
the high voltage
cable
Compression is
good
Compression is
low
The gap in the spark plug tip is clogged.
Carbon is stuck on the spark plug
The spark plug has a short circuit due to faulty
insulation.
The gap in the spark plug is the wrong size.
The stop button switch has a short circuit.
The ignition coil is broken.
The muffler is clogged with carbon.
The wrong fuel was used.
The air cleaner is clogged.
The fuel is contaminated with water or dirt.
The cylinder head gasket is blown or the head is not
correctly tightened.
The piston rings don't fit well.
The cylinder is worn.
The spark plug is not seated tightly.
The valve seat is damaged.
No fuel in the fuel tank.
Faulty fuel cock operation.
The fuel filter is clogged.
The air hole in the cap on the fuel tank is clogged.
Air is trapped in the fuel line.
2.Faulty operation
Too little
power
Engine
overheats
Smoke
comes from
the muffler
Good compression
and no misfiring
Good compression
but misfires
Black smoke
Blue
smoke
White smoke
Dirt in the air cleaner.
Air trapped in the fuel line.
Carbon has accumulated in the cylinder.
Faulty ignition coil.
Dirt on the spark plug.
Ignition coil shorts sometimes.
Choke lever wasn't returned to the open position.
Blended oil (for 2-cycle engines) was used.
Too much oil.
Engine oil leaked into the air cleaner when the
machine was laid down on the wrong side.
Worn piston rings.
The piston rings don't fit well.
Moisture in the gasoline.
The air cleaner is wet.
Low compression (See ”Compression in low” above
Excessive accumulation of carbon in the combustion chamber.
Clog exhaust port or muffler.
Faulty spark plug.
Good
compression
Compression
is low
(In the winter, the machine may emit white smoke for a while when first started in the morning.
This is not abnormal.)
Faulty governor adjustment.
Faulty governor spring.
Faulty fuel flow.
Air being sucked into the fuel line.
Engine speed fluctuates
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