High Fuel Consumption; Excessive Consumption/Exhaust Noise; Noise Increase; Engine Overheating - Derbi GP1 50 cc Workshop Manual

HIGH FUEL CONSUMPTION

E
XCESSIVE CONSUMPTION
CAUSES POSSIBLE
Air filter clogged or dirty
Inefficient starter
EXCESSIVE EXHAUST NOISE
N
OISE INCREASE
CAUSES POSSIBLE
Secondary air metallic tube deteriorated
Secondary air circuit components faulty
SURRISCALDAMENTO MOTORE
E
NGINE OVERHEATING
CAUSES POSSIBLE
No coolant within the cooling circuit
Air-bleed badly performed
Thermostat remains shut
Coolant leaks from radiator
Coolant leaks from system
Coolant leaks from crankcase draining hole
Coolant pump impeller bearing seized
Mixer drive-belt snapped
131
WORK
Clean
Check: electric connections, circuit continuity, mecha-
nical sliding, and presence of power
WORK
Check the seal of the tubing against crankcase and secon-
dary air box. Check tubing between box and exhaust.
Check components and tubing. Check correct assem-
bly. Replace components if damaged.
WORK
Top up the level and ensure there are no leaks within
the circuit.
Repeat the operation
Replace
Replace the radiator
Overhaul the system
Replace coolant sealing ring on half-crankcase from
transmission-side
Replace bearings and, if necessary, shaft and impeller
Replace belt and check the cylinder assembly is not da-
maged