Derbi BOULEVARD 50 2T, Workshop Manual

Page: 39 / 154

High fuel consumption
HIGH FUEL CONSUMPTION
Possible Cause Operation
Air filter blocked or dirty. Clean according to the procedure
Starter inefficient Check: electric wiring, circuit continuity, mechanical sliding and
power supply
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 BRAKES
Possible Cause Operation
Slippage 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 characteristics equivalent on
the three masses
Check that the clutch bell is not scored or worn abnormally
Never operate the engine without the clutch bell
Check the cap with filter is fitted to the transmission cover
Insufficient braking
BRAKING SYSTEM MALFUNCTION
Possible Cause Operation
Poor braking The rear (drum type) brake is adjusted by regulating the special
adjustment (on the wheel) bearing in mind that, with the control
levers in the rest position, the wheels must turn freely.
The braking action should begin when the brake levers are
pressed by about a third.
Check the brake pad wear.
If it is not possible to remove any problems by simply adjusting
the transmissions, check the brake pads and front brake disc,
the brake shoes and the rear drum. If you encounter excessive
wear or scoring, make the necessary replacements.
Air bubbles inside the hydraulic braking system Carefully bleed the hydraulic braking system, (there must be
no flexible movement of the brake lever).
Fluid leakage in hydraulic braking system Elastic fittings, piston seals or brake pump breakdown, replace
The brake fluid has lost its properties Replace the front brake fluid and top up to the correct level in
the pump
Defective sliding of the cables in their sheathes Lubricate or substitute
Brake noise Check the wear of the brake pads and/or shoes
Troubleshooting
TROUBL - 39