Starting Difficulties - Derbi boulevard 125 4t Workshop Manual

Troubleshooting

Starting difficulties

Possible Cause
Battery flat
Faulty spark plug or incorrect ignition advance
- Engine flooded.
Incorrect valve sealing or valve adjustment
Rpm too low at start-up or engine and start-up
system damaged
Altered fuel characteristics
Vacuum operated cock failure
Failing automatic starter on the carburettor
Start-up enabling buttons failure
Carburettor nozzles clogged or dirty
Air filter obstructed or dirty.
Excessive oil consumption/Exhaust smoke
EXCESSIVE OIL CONSUMPTION/SMOKEY EXHAUST
Possible Cause
Worn valve guides
Worn valve oil guard
Oil leaks from the couplings or from the gaskets Check and replace the gaskets or restore the cou-
Worn or broken piston rings or piston rings that
have not been fitted properly
TROUBL - 46
DIFFICULTY STARTING UP
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
Replace the spark plug or check the ignition circuit
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.
Inspect the head and/or restore the correct clear-
Check the starter motor and the kick-starter unit
Drain off the fuel no longer up to standard; then,
Check that fuel is adequately supplied through the
pipe by applying a vacuum to the suction pipe
Check the electrical wiring and mechanical move-
Check continuity using an Ohm meter, with the
Dismantle, wash with solvent and dry with com-
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
Check and replace the head unit if required
Replace the piston cylinder unit or just the piston
Operation
components
ance
refill
ment, replace if necessary.
switch pressed; replace if necessary
pressed air
then reassemble.
Operation
Replace the valve oil guard
pling seal
rings