61
Trouble
Location
Remedy
Engine will not fire, or has
stopped. Carburetter can be flooded
Compression regular
Sparking Regular
Carburetter in order
Engine overheated.
Insufficient Lubrication
Throttle cable broken.
Air leak between
carburetter and cylinder.
Let the engine cool and keep
it at low revolutions.
Take care that petroil is
mixed properly at ratio 20 to
1 (16:1 during running-in).
Replace throttle cable.
Replace gasket.
Carburetter
Jet chocked.
Leaking float.
Float stuck.
Float needle does not set
properly.
Remove and clean the jet.
Solder or replace the float.
Release the float.
Repair or replace the needle.
Lumpy running
Engine lacks power
Permanent
Carbon accumulation in
cylinder barrel and head,
exhaust passages and
silencers.
Insufficient fuel feed.
Improperly set ignition.
Improper carburetter
setting (improper mixture).
Exhaust silencers clogged.
Worn cylinder interior and
piston.
Engine drags wrong air
(crankcase halves or
carburetter stump are not
tight)
Remove cylinder head and
barrel, exhaust pipes and
decarbonise.
Dismantle and clean fuel
pipe.
Adjust breaker point gap and
ignition advance.
Adjust idling peed, needle
position and clean air
cleaner.
Dismantle and decarbonise.
Rebore cylinder, replace
piston and rings, have
gudgeon pin bearing checked
(at an accredited workshop)
Take both cranckcase halves
apart, clean joint faces.
Apply jointing compound
and reassemble properly.
Replace carburetter stump
gasket.
Temporary
Fuel pipe or cleaner partly
clogged.
Throttle control cable sticks
Engine overheated.
Faulty sparking plug.
Clean fuel pipe or cleaner.
Lubricate or replace.
Allow the engine to cool and
keep it at low revolutions.
Replace the sparking plug.
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