26
Engine does
not reach its
maximum
speed
1. Fouled spark plug
(remains of carbon
on the electrodes)
spark gap to large
2. Fouled carburettor
or its jets
3. Fouled air filter
4. Exhaust, exhaust
channel
5. Sealing ring in
crankcase not
sealing properly
6. Worn cylinders,
pistons and piston
rings
7. Wrong fuel mix (too
much oil)
8. Bad ignition
1. Clean the spark
plug, check its
temperature,
replace if needed.
Adjust at 0.6-
0.7mm
2. Clean the
carburettor with air
3. Clean
4. Take out the
exhaust and clean
it, remove remains
of carbon
5. Replace
6. Replace the
cylinder, piston or
piston rings, replace
the cylinder and
piston, assembly
7. Fill up according to
the instructions
8. Adjust the ignition
coil gap (0.3-
0.4mm)
Engine would
not stop
1. The switch has
failed
2. The wiring terminal
was disconnected
1. Change the switch
2. Connect up the
wiring terminal
