60
IV. DEFECTS, CAUSES AND REMEDIES
Trouble Location Remedy
Lumpy Running
Engine Knocks
Engine overheated.
Plug points glow, faulty
sparking plug.
Cylinder head clogged with
carbon.
Over-advanced ignition.
Exhaust silencer clogged.
Wait until engine has cooled do not run
at high revolutions.
Replace sparking plug.
Remove cylinder head and decarbonise.
Adjust correct gap and reset ignition
timing.
Detach exhaust silencer and clean it.
Engine misfires
Regular sparking
Water or oil in carburetter.
Insufficient fuel supply.
Temporary short circuiting
caused by faulty plug lead.
Weak mixture.
Improperly mixed petroil.
Clean the carburetter.
Open reserve supply tap. pass fuel
over, re-fuel, inspect inlet manifolds.
Tape crack in insulation or replace
lead.
Adjust carburetter.
Stir mixture properly before re-fuelling.
Irregular sparking
Unsuitable sparking plug.
Oiled sparking plug.
Excessive spark gap.
Dirty breaker points.
Improperly adjusted breaker
points.
Temporary short circuiting
caused by faulty plug lead.
Replace sparking plug.
Remove and clean sparking plug.
Adjust correct spacing to 0.45 mm
(0.018 in).
Clean the points using a cloth soaked
in petrol.
Adjust to 0.4 mm.
Tape crack in insulation or replace
lead.
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