Yamaha Utility Trailer YW125Y_ User Manual

8-3

TRBL

SHTG

FAULTY CLUTCH/OVERHEATING

EAS00853

FAULTY CLUTCH

ENGINE OPERATES BUT SCOOTER WILL
NOT MOVE

V-belt

8 Bent, damaged or worn V-belt
8 Slipping V-belt

Primary pulley cam and primary pulley slider

8 Damaged or worn primary pulley cam
8 Damaged or worn primary pulley slider

Clutch spring(s)

8 Damaged clutch spring

Transmission gears

8 Damaged transmission gear

CLUTCH SLIPS
Clutch shoe springs

8 Damaged, loose or worn clutch shoe

spring

Clutch shoes

8 Damaged or worn clutch shoe

Primary sliding sheave

8 Seized primary sliding sheave

POOR STARTING PERFORMANCE
V-belt

8 V-belt slips
8 Oil or grease on the V-belt

Primary sliding sheave

8 Faulty operation
8 Worn pin groove
8 Worn pin

Clutch shoes

8 Bent, damaged or worn clutch shoe

POOR SPEED PERFORMANCE

V-belt

8 Worn V-belt
8 Oil or grease on the V-belt

Primary pulley weight(s)

8 Faulty operation

8 Worn primary pulley weight

Primary fixed sheave

8 Worn primary fixed sheave

Primary sliding sheave

8 Worn primary sliding sheave

Secondary fixed sheave

8 Worn secondary fixed sheave

Secondary sliding sheave

8 Worn secondary sliding sheave

EAS00855

OVERHEATING

ENGINE
Clogged coolant passages

8 Heavy carbon buildup in cylinder head

and piston

Engine oil

8 Incorrect oil level
8 Incorrect oil viscosity
8 Inferior oil quality

FUEL SYSTEM
Throttle body

8 Faulty throttle body
8 Damaged or loose throttle body joint

Air filter

8 Clogged air filter element

CHASSIS
Brake(s)

8 Dragging brake

ELECTRICAL SYSTEMS
Spark plug

8 Incorrect spark plug gap
8 Incorrect spark plug heat range

Ignition system

8 Faulty ECU
8 Faulty engine temperature sensor

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