Poor Performance; Rear Wheel Spins At Idle - Derbi boulevard 125 4t Workshop Manual

Troubleshooting
Engine

Poor performance

Possible Cause
Air filter blocked or dirty.
Fuel nozzles or cock clogged or dirty
Dirty or faulty vacuum-operated cock
Failing automatic starter on the carburettor
Excessive driving belt wear
Lack of compression: parts, cylinder and valves
Oil level exceeds maximum
Excess of encrustations in the combustion cham-
Incorrect timing or worn timing system elements
Muffler obstructed
Inefficient automatic transmission
Wrong valve adjustment
Overheated valves
Valve seat distorted
Worn cylinder, Worn or broken piston rings

Rear wheel spins at idle

REAR WHEEL ROTATES WITH ENGINE AT IDLE
Possible Cause
Idling rpms too high
Clutch fault
POOR PERFORMANCE
worn
ber
Operation
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.
Dismantle, wash with solvent and dry with com-
pressed air
Check the filter on the cock, remove the petrol and
wash the tank, if necessary. Replace the cock as
a last resource.
Check the electrical wiring and mechanical move-
ment, replace if necessary.
Check it and replace, if necessary
Replace the worn parts
Check for causes and fill to reach the correct level
Descale the cylinder, the piston, the head and the
valves
Time the system again or replace the worn parts
Replace
Check the rollers and the pulley movement, re-
place the damaged parts and lubricate the driven
pulley moveable guide with Montblanc Molybde-
num Grease
Adjust the valve clearance properly
Remove the head and the valves, grind or replace
the valves
Replace the head assembly
Replace the piston cylinder assembly or just the
piston rings
Operation
Adjust the engine idle speed and the CO%, if nec-
essary.
Check the springs / clutch masses
TROUBL - 45