Probable cause and troubleshooting
CLUTCH SLIPPAGE
Possible Cause Operation
Insufficient idle stroke Adjust the stroke.
Weak return spring Replace.
Worn or burned driven disc gasket Replace the disc.
Insufficient oil in the differential transmission or unsuitable oil Restore the oil level or replace.
SPONTANEOUS GEARS DISENGAGEMENT
Possible Cause Operation
Gearbox housing worn Verify and replace if necessary.
Badly adjusted control cable Record.
Transmission gears or spiders not properly assembled or worn Review.
NOISE
Possible Cause Operation
Worn or leaking shock absorbers Replace.
Flexible buffers of the swinging arms worn Replace.
Insufficient lubrication of the hubs Remove the hubs and fill the appropriate chamber with special
grease.
Recommended products
AGIP GREASE PV 2 Multipurpose grease
NLGI 2 specifications; ISO-LXBIB2
SECONDARY AIR TUBE JOINT FAILURE ON THE SILENCER - APE TM KAT
Possible Cause
Operation
Secondary air blade locking Replace.
Secondary air filter clogging Clean the filter and the box.
Clogging of the secondary air joint on the silencer Descale the joint taking care to not let the residues fall into the
silencer.
Engine
THE ENGINE STOPS
Possible Cause
Operation
Idle speed too low Work on the appropriate adjuster screw del of the carburettor.
Dirt or water in the mixture or in the ducts Clean thoroughly.
Inefficient spark plug Clean and adjust the gap between the electrodes or replace.
Cock obstruction Clean.
H.V. cable or spark plug hood damaged Check or replace.
Fuel tank cap breather obstruction (defective fuel system) Clean properly.
CRANKSHAFT KNOCKS
Possible Cause
Operation
Excessive clearance of the main bearings Replace.
Big end failure Replace the crankshaft.
Crankshaft unbalanced Check the alignment
Piston pin worn Replace.
RINGING OF THE PISTON
Possible Cause
Operation
Excessive clearance between the piston and cylinder Replace the piston and correct the cylinder.
Excessive clearance of the roller pin-connecting rod small end
or piston pin
Inspect (for any replacement of the rollers of the connecting rod
small end, see the section Fitting clearances).
APE TM Benzina Troubleshooting
TROUBL - 43