Specifications

(6)Spark plug
1.Remove spark plug.
2.Check the spark plug electrode and see whether it is burnt out/ carbonized or not.
3.Clean the electrode, if it is dirty.
Spark plug specification
NGK: BP7HS or BPR7HS equivalent
Gap of spark plug:0.6~0.7mm spark plug
Electrode burnt out
Carbon piled up or not
Washer is distorted or not
Porcelain is cracked or not
(7) Cylinder Pressure
1.Measure it when the engine is warm.
2.Remove the cover at the right hand of the
step floor.
3.Remove the spark plug then place cylinder
pressure gauge. Then fully open the
throttle and act on the starter motor to
measure the compression pressure.
Compression pressure: 6.0kg/cm
2
at 750
rpm
＊When the compression pressure is too low,
check the following:
a. Gasket of the cylinder head is damaged.
b. Piston ring worn-out
c. Piston or cylinder worn-out
＊The cylinder compression pressure is usually too high when there is too much carbonization in
the combustion chamber and the piston tip.