11
Inflexible rotation (low revolutions or powerless)
Fault Diagnosis
Adjustment
Fault Cause
Engine rpm
rises
Engine rpm
cannot rise
completely
Slowly start the
engine
Proper ignition
time
Improper ignition
time
Adjust
ignition
timing and adopt
ignition timing light
Compression
pressure is
normal
Compression
pressure is
too low
Determination of
compression
pressure
No blockage
Blocked
Polluted and
discolored
No pollution
and discoloring
Remove the spark
plug for inspection
Throttle blockage
inspection
Normal
Abnormal
No overheat
Overheat
No knocking
Knocking
Accelerate to travel
or operate
Engine overheat
Check the lubrication of
machine oil in cylinder head
Machine oil is
normal
Excessive
machine oil
Check whether the machine
oil in crankshaft tank is
excessive or polluted
Blockage of air filter
Failure of gasoline
Tube blockage of fuel tank
evaporation control system
Blockage of exhaust pipe
Failure of automatic choke
apparatus
Failure of throttle
Failure of ECU Assembly
Failure of trigger
Failure of cylinder piston and
piston ring
Air leakage of cylinder gasket
Remove dirts
Remove dirts
Thermal value of spark plug is
sub-standard.
Excessive machine oil
Insufficient machine oil
No replacement of machine oil
Piston cylinder is worn.
Gaseous mixture is too thin.
Failure of gasoline
Too much carbon deposits in
combustion chamber
Ignition time is too early
Too much carbon deposits in
combustion chamber
Failure of gasoline
Clutch slippage
Gaseous mixture is thin.
Ignition time is too early
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