Gilera Runner RST 50 SP, Service Station Manual, Page: 40 / 183

Possible Cause Operation
Starter inefficient Check: electric wiring, circuit continuity, mechanical sliding and
power supply
Engine overheating
ENGINE OVERHEATING
Possible Cause Operation
Lack of liquid in the cooling circuit. Restore the level and check the absence of losses from the
circuit
Incorrect air bleeding Repeat the operation
Thermostat remains closed Replace
Liquid leak from the radiator Replace radiator
Liquid leak from the system Overhaul of the system
Coolant leaks from crankcase draining hole Replace coolant sealing ring on half-crankcase from transmis-
sion-side
Bearings shaft support impeller blocked Replace the bearings and the shaft with impeller
Breakage of mixer belt Replace the belt and check that the thermal unit has not been
damaged
SAS malfunctions
SLACKENING OF THE RUBBER JOINT OF THE SECONDARY AIR PIPE ON THE MUF-
FLER
Possible Cause Operation
Secondary air reed blocking Replace
Secondary air filter clogging Clean the filter and the housing
Blockage of the secondary air fitting on the muffler Remove the encrustations from the joint being careful not to let
the debris fall into the muffler
Transmission and brakes
Clutch grabbing or performing inadequately
CLUTCH
Possible Cause Operation
Tear or irregular functioning
Check that the masses open and return normally
Check that there is no grease on the masses
Check that the clutch masses' contact surface with
the clutch bell is mainly in the middle with charac-
teristics equivalent on the three masses
Check that the clutch bell is not scored or worn
abnormally
Never operate the engine without the clutch bell
Insufficient braking
I
NSUFFICIENT BRAKING
Possible Cause Operation
Inefficient braking system Check the pad wear (1.5 min). Check that the brake discs are
not worn, scored or warped. Check the correct level of fluid in
the pumps and change brake fluid if necessary. Check there is
Troubleshooting
Runner RST 50 SP
TROUBL - 40