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Troubleshooting Table of the Engine
Failures Causes Troubleshooting
No fuel in the
carburetor
1. No fuel in the tank.
2. The tank tap is not open.
3. The tank tap is clogged.
4. The needle-valve in the float
chamber is blocked.
5. The main jet hole is clogged.
1. Fill
fuel.
2. Open the tap.
3. Clean the oil tank and tap.
4. Dismantle the carburetor and
clean it.
5. Dismantle the carburetor and
clean it.
High-volta
ge line has
normal
spark, but
the spark
plug does
not.
1. There is oil dirt in the spark
plug.
2. The magnetic core or electrode
is broken.
3. The electrode of spark plug has
carbon deposit.
4. The clearance of spark plug is
not proper.
1.Dismount and dry it.
2.Replace the spark plug.
3.Clear carbon deposit.
4.Adjust the clearance.
The engine can’
t start or stop suddenly
The carburetor has oil
The spark
plug has a
normal
spark.
But the
cylinder
doesn’t
compress
properly.
1. The pad of cylinder cover has
leakage.
2. The spark plug is loose.
3. The piston ring is in the
improper position.
4. The piston and ring are
excessively worn out or the
ring is broken.
5. The cylinder is seriously worn.
6. The intake pipe leaks.
7. The oil seal of crankshaft is
damage.
1. Tighten the screw or replace the
pad.
2. Tighten the plug.
3. Clear the ring and the carbon
deposit around it.
4. Replace the piston and its ring.
5. Replace the cylinder body.
6. Tighten or replace the rubber
ring.
7.Replace the oil seal.
(Continue)
