Derbi Rambla 250 Manual page 49

Troubleshooting
Engine
Excessive oil consumption/Exhaust smoke
Possible Cause
Incorrect valve adjustment
Overheated valves
Deformed/worn valve seat
Worn cylinder, Piston ring worn or broken
Piston rings worn, broken or not adequately fitted
Oil leakage from the couplings or the gaskets
Valve oil seal worn
Valve guides worn
Insufficient lubrication pressure
Possible Cause
By-Pass remains open
Oil pump with excessive clearance
Oil filter too dirty
Oil level too low
Clutch grabbing or performing inadequately
IRREGULAR CLUTCH PERFORMANCE OR SLIPPAGE
Possible Cause
Faulty clutch
Suspension oil leakage
Possible Cause
Seals faulty or damaged
EXCESSIVE WEAR
Remove the head and the valves, grind or replace the valves
Check and replace the gaskets or restore the coupling sealing
POOR LUBRICATION PRESSURE
Check the By-Pass and replace it, if required. Carefully clean
Check that there is no grease on the masses. Check that the
faying surface between the clutch masses and the clutch bell
is mainly in the middle and with equivalent characteristics on
the three masses. Check that the clutch bell is not scored or
OIL LEAKAGE FROM SUSPENSION
Replace the shock absorber. Check the wear conditions of the
Operation
Adjust valve clearance adequately
Replace the head unit
Replace the cylinder piston unit or the piston rings
Replace the cylinder piston unit or just the rings
Replace the valve oil seal
Check the head unit and replace it, if required
Operation
the By-Pass area.
Check the sizes of the oil pump components
Replace the cartridge filter
Fill up to the correct level with recommended oil type
Operation
abnormally worn
Operation
head set cups and the adjustments.
TROUBL - 49