Part IV Faults Diagnosis
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4-10 Check the cylinder pressure
1) Disassemble spark plug cap and spark plug.
2) Assemble pressure meter in the spark plug hole.
3) Use starter motor make the engine runing.
Cylinder
pressure
Right = 10 ~13 bar
Left = 3 bar
NOTE
Speed is faster than 1000r/min, the pressure relief valve
does not work, at this time, we can get the operationg
cylinder pressure.
At 1400 rpm pressure = 10 to 13 Kgf/cm2
4-11.Checking spark
1) Remove spark plug
2) Put the spark plug on the spark cap
3) Connect (－) electrode of the spark plug（thread）to grounding, pull starter to check if there is spark at the
electrode joint.
WARNING
Don’t grape spark terminal by wet hand
when testing.
If touching the high voltage line by wet
hand, pulling starter can produce high
voltage electric, being danger.
Sprinkled fuel can cause fire around the
spark plug. First, clean the fuel, then
check. When checking, keep far away from
the spark plug hole.
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