TROUBLESHOOTING GUIDE
Case 1. Starting failure
CHECK
PROBABLE
CAUSES
ACTION
fuel tank
→
incorrect fuel
→
drain it and use correct fuel
fuel filter
→
fuel filter is clogged
→
clean
carburetor adjustment
screw
→
out of normal range
→
adjust to normal range
sparking (no spark)
→
→
spark plug is
fouled/wet
plug gap is incorrect
→
→
clean/dry
correct (GAP: 0.6 ~ 0.7 mm)
spark plug
→
disconnected
→
retighten
Case 2. The engine will not reach the maximum output
CHECK
PROBABLE CAUSES
ACTION
Spark plug
→
Fouled plug, (the carbon
residues on electrodes)
too big distance
between the electrodes.
→
Clean the plug, check the
thermal value and replace it
if necessary Set 0.6 - 0.7 mm
carburettor
→
Fouled carburettor or
carburettor jets.
→
Clean the carburettor blow it
off
Air filter
→
Fouled air filter
→
Clean
exhaust
→
Exhaust, exhaust pipe
→
Remove the exhaust pipe,
clean and remove carbon
residues.
Cylinder /piston /piston
ring
→
The packing ring in the
crankcase leaking Worn
cylinders, pistons, piston
rings
→
Replace the cylinder, piston
or piston rings, grind cylinder
and piston, install
fuel
→
Poor fuel mix (too much
oil
→
Fill up according to
instructions
Case 3. The engine will not stop
CHECK
PROBABLE CAUSES
ACTION
Spark plug
→
The plug is pale grey
with marks of white-hot
(melting drops)
→
Fit in the plug of higher
thermal value.
Cylinder
→
Carbon residue in the
ignition area.
→
Clean the cylinder head,
piston bottom and cylinder the
engine block
Summary of Contents for HCOMBI336F-A
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