After fire
Fuel, intake system
Ignition timing,
spark advance
Spark plugs, ignition device
Back
fire
Fuel, intake system
Ignition timing,
spark advance
Valve timing
Inspection content
Check the operation and adjustment of parts that might make the air-fuel mixture too rich.
Air cleaner element clogging
ldle adjusting screw too loose
Float level too high?
Too much choke (Autochoke mechanism defective)
Check the initial setting of the ignition timing and that the spark advance is operating normally.
Is the timing too retarded when idling?
*
Spark advance operation inspection (Do the vacuum advancer and the governer controller
start operating a little late when the accelerator pedal is suddenly released?)
Is the stationary plate not sliding well?
Correct the cause of any occasional missing of the ignition.
Are the specified spark plugs being used?
lnspect for soiling, wear or gap defect of the spark plugs.
Inspect for soiling or poor connections in the secondary circuit of the ignition system.
Inspection content
Check the operation and adjustment of parts that might make the air-fuel mixture too lean.
Float level too low?
Insufficient ejection from the accelerator pump
Power jet clogging
Power piston malfunction
Choke valve malfunction (if it opens too early when cold, the mixture becomes lean)
ldle adjusting screw too tight (air-fuel mixture in the slow speed system becomes too lean)
Air being sucked in from the intake manifold
Inspect to see whether the ignition timing is too retarded.
Is the timing too retarded when idling?
Timing control operation inspection (this occurs easily after engine
OIH,
or reinstalling of the
distributor
-
whenever the timing is extremely out)
Is the valve timing out?
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