This section makes it possible to find what solutions to apply when troubleshooting.
For each breakdown, a list of the possible causes and respective interventions is given.
Engine
Poor performance
POOR PERFORMANCE
Possible Cause Operation
The carburettor is dirty; fuel pump or vacuum valve
damaged
Remove, wash with solvent and dry with com-
pressed air or replace
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
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.
Automatic starter failure Check: mechanical movement, electric connec-
tion and fuel supply, replace if required.
Oil level exceeds maximum Check for causes and fill to reach the correct level
Lack of compression: parts, cylinder and valves
worn
Replace the worn parts
Transmission belt worn 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
Clutch slipping Check the clutch system and/or the bell and re-
place if necessary
Overheated valves Remove the head and the valves, grind or replace
the valves
Wrong valve adjustment Adjust the valve clearance properly
Valve seat distorted Replace the head assembly
Air filter 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.
Defective floating valve Check the proper sliding of the float and the func-
tioning of the valve
Starting difficulties
DIFFICULT STARTING
Possible Cause Operation
Altered fuel characteristics Drain off the fuel no longer up to standard; then,
refill
Troubleshooting MP3 125
TROUBL - 2
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