ZHEJIANG KAYO MOTOR CO., LTD.
www.kayomoto.com
- 61 -
TROUBLESHOOTING
If the engine wants to be operated normally, it should meet the following four requirements:
1.
Good fuel: There is a certain ratio of combustible mixture in the cylinder.
2.
Good spark: The spark plug can emit a strong spark at the specified time.
3.
Enough compression: There is enough compression pressure in the cylinder.
4.
Valve timing: correct valve opening time.
After the engine malfunctions, you can focus on the above four aspects to start, check, analyze the
cause of the malfunction, and eliminate it
FAULTS
Inspection Method
Results
Possible Cause
The engine cannot be
started or difficult to
start
Check whether the
fuel flows into the
carburetor
Fuel does not flow
into the carburetor
No gasoline in the
fuel tank
Blocked tubing from
the fuel tank to the
carburetor
Fuel flows into the
carburetor
The float in the
carburetor is stuck
The vent on the fuel
tank cap is blocked
Remove the spark
plug to test the spark
Weak sparks or no
sparks at all
Spark plug failure
The spark plug is not
clean
Electronic ignition is
malfunctioning
The magneto is faulty
Good sparks
Bad wiring, broken
High-voltage cable is
open or
short-circuited
Ignition coil is open
or short-circuited
The ignition switch is
faulty
Test cylinder pressure
Low Pressure
The starting
mechanism is slipping,
and the engine cannot
be turned
Normal pressure
Valve clearance is too
small
Valve opening
blocked
Cylinder or piston
ring wear
