Engine
Poor performance
POOR PERFORMANCE
Possible Cause Operation
Air filter blocked 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.
Fuel nozzles or cock clogged or dirty Dismantle, wash with solvent and dry with com-
pressed air
Dirty or faulty vacuum-operated cock Check the filter on the cock, remove the petrol and
wash the tank, if necessary. Replace the cock as
a last resource.
Failing automatic starter on the carburettor Check the electrical wiring and mechanical move-
ment, replace if necessary.
Excessive driving belt wear Check it and replace, if necessary
Lack of compression: parts, cylinder and valves
worn
Replace the worn parts
Oil level exceeds maximum Check for causes and fill to reach the correct level
Excess of encrustations in the combustion cham-
ber
Descale the cylinder, the piston, the head and the
valves
Incorrect timing or worn timing system elements Time the system again or replace the worn parts
Muffler obstructed Replace
Inefficient automatic transmission Check the rollers and the pulley movement, re-
place the damaged parts and lubricate the driven
pulley moveable guide with Montblanc Molybde-
num Grease
Wrong valve adjustment Adjust the valve clearance properly
Overheated valves Remove the head and the valves, grind or replace
the valves
Valve seat distorted Replace the head assembly
Worn cylinder, Worn or broken piston rings Replace the piston cylinder assembly or just the
piston rings
Rear wheel spins at idle
REAR WHEEL ROTATES WITH ENGINE AT IDLE
Possible Cause Operation
Idling rpms too high Adjust the engine idle speed and the CO%, if nec-
essary.
Clutch fault Check the springs / clutch masses
Fly 125 - 150 4T Troubleshooting
TROUBL - 45
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