Starting difficulties
DIFFICULTY STARTING UP
Possible Cause Operation
Battery flat Check the state of the battery. If it shows signs of
sulphation replace it and bring the new battery into
service charging it for eight hours at a current of
1/10 of the capacity of the battery itself
Faulty spark plug or incorrect ignition advance Replace the spark plug or check the ignition circuit
components
- Engine flooded. Try starting-up with the throttle fully open. If the
engine fails to start, remove the spark plug, dry it
and before refitting, make the motor turn so as to
expel the fuel excess taking care to connect the
cap to the spark plug, and this in turn to the ground.
If the fuel tank is empty, refuel and start up.
Incorrect valve sealing or valve adjustment Inspect the head and/or restore the correct clear-
ance
Rpm too low at start-up or engine and start-up
system damaged
Check the starter motor and the kick-starter unit
Altered fuel characteristics Drain off the fuel no longer up to standard; then,
refill
Vacuum operated cock failure Check that fuel is adequately supplied through the
pipe by applying a vacuum to the suction pipe
Failing automatic starter on the carburettor Check the electrical wiring and mechanical move-
ment, replace if necessary.
Start-up enabling buttons failure Check continuity using an Ohm meter, with the
switch pressed; replace if necessary
Carburettor nozzles clogged or dirty Dismantle, wash with solvent and dry with com-
pressed air
Air filter obstructed or dirty. Dismantle the sponge, wash with water and sham-
poo, then soak it in a mixture of 50% petrol and
50% of specific oil (Selenia Air Filter Oil), then
hand dry without squeezing, allow to drip dry and
then reassemble.
Excessive oil consumption/Exhaust smoke
EXCESSIVE OIL CONSUMPTION/SMOKEY EXHAUST
Possible Cause Operation
Worn valve guides Check and replace the head unit if required
Worn valve oil guard Replace the valve oil guard
Oil leaks from the couplings or from the gaskets Check and replace the gaskets or restore the cou-
pling seal
Worn or broken piston rings or piston rings that
have not been fitted properly
Replace the piston cylinder unit or just the piston
rings
Troubleshooting Fly 125 - 150 4T
TROUBL - 46
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