Poor Medium And High Speed Performance; Fuel System; Compression System; Faulty Automatic (V-Belt Type - Yamaha CW50L Service Manual

I L I I T. L
TRBL _ G
9 FAULTY AUTOMATIC
SHTG
POOR MEDIUM AND HIGH SPEED PERFORMANCE
SHTG • =
°
POOR MEDIUM AND HIGH SPEED PERFORMANCE FAULTY AUTOMATIC (V-BELT TYPE)
FUEL SYSTEM SCOOTER DOES NOT MOVE WHILE ENGINE IS OPERATING.
Fuel tank Carburetor V-belt Secondary sheave
- Clogged fuel filter • Deteriorated fuel, fuel containing water or • Worn, damaged or slipped v-belt • Broken compression spring
• Deteriorated fuel or fuel containing water or foreign material Primary sheave • Pealed lining from clutch shoe
foreign material • Sucked-in air • Worn or damaged cam plate o Worn spline of clutch housing
• Clogged fuel tank cap • Deformed float • Worn or damaged slider bushing
Fuel cook • Groove-worm needle valve
• Clogged fuel hose • Improperly sealed valve seat
Air cleaner • Improperly set clip position of jet needle CLUTCH-OUT FAILURE
° Clogged air cleaner • Improperly adjusted fuel _evel Primary sheave Secondary sheave
• Clogged or loose main jet • Seized primary sliding sheave and collar o Broken or fatigued clutch shoe spring
• Clogged or loose main nozzle
POOR STANDING START (LOW CLIMBING ABILITY)
ELECTRICAL SYSTEM V-belt Secondary sheave
Spark plug CDI unit system • Worn, damaged or slipped v-belt • Fatigued compression spring
• Improper plug gap • Faulty CDI unit Primary sheave • Improper operation of secondary sliding sheave
• Worm electrodes • Faulty source coil • Worn or improper operation of weight
• Wire between terminals broken • Faulty pick-up coil
• improper heat range
• Faulty spark plug cap POOR ACCELERATION (POOR HIGH SPEED)
V-belt
• Worn or greasy V-belt
Secondary sheave
• Worn or greasy clutch shoe
• Improper operation of secondary sliding sheave
COMPRESSION SYSTEM
Cylinder and cylinder head Crankcase and crankshaft
• Loose spark plug - Improperly seated crankcase
• Loose cylinder head or cylinder • Improperly sealed crankcase
• Broken cylinder head gasket (damaged oil seal)
• Broken cylinder gasket . Seized crankshaft
• Worn, damaged or seized cylinder
Piston and piston rings Reed valve
• Impropedy installed piston ring • Deformed reed valve stopper
• Worn, fatigued or broken piston ring • Improperly seated reed valve
• Seized piston ring • Loose intake manifold
• Seized or damaged piston • Broken gasket
• Broken reed valve
8-3 8-4