Fork Legs; Poor Speed Performance; Overheating; Engine - Yamaha YJ125S Service Manual

OVERHEATING/POOR BRAKING PERFORMANCE/

POOR SPEED PERFORMANCE

V-belt
8Oil or grease on the V-belt
Primary pulley weight(s)
8Faulty operation
8Worn primary pulley weight
Primary fixed sheave
8Worn primary fixed sheave
Primary sliding sheave
8Worn primary sliding sheave
Secondary fixed sheave
8Worn secondary fixed sheave
Secondary sliding sheave
8Worn secondary sliding sheave
EAS00854

OVERHEATING

ENGINE

Cylinder head and piston
8Heavy carbon buildup
Engine oil
8Incorrect oil level
8Incorrect oil viscosity
8Inferior oil quality

FUEL SYSTEM

Carburetor
8Incorrect main jet setting
8Incorrect fuel level
8Damaged or loose carburetor joint
Air filter
8Clogged air filter element

CHASSIS

Brakes
8Dragging brake

ELECTRICAL SYSTEMS

Spark plug
8Incorrect spark plug gap
8Incorrect spark plug heat range
Ignition system
8Faulty C.D.I. unit

FAULTY FRONT FORK LEGS

EAS00859

POOR BRAKING PERFORMANCE

Disc brake
8Worn brake pad
8Worn brake disc
8Air in hydraulic brake system
8Leaking brake fluid
8Faulty brake caliper kit
8Faulty brake caliper seal
8Loose union bolt
8Damaged brake hose
8Oil or grease on the brake disc
8Oil or grease on the brake pad
8Incorrect brake fluid level
Drum brake
8Worn brake shoe
8Worn or rusty brake drum
8Incorrect brake camshaft lever position
8Incorrect brake shoe position
8Damaged or fatigued brake shoe spring
8Oil or grease on the brake shoe
8Oil or grease on the brake drum
8Broken brake torque rod
EAS00860
FAULTY FRONT FORK LEGS

LEAKING OIL

8Bent, damaged or rusty inner tube
8Cracked or damaged outer tube
8Improperly installed oil seal
8Damaged oil seal lip
8Incorrect oil level (high)
8Loose damper rod assembly bolt
8Damaged damper rod assembly bolt cop-
per washer
8Cracked or damaged cap bolt O-ring

MALFUNCTION

8Bent or damaged inner tube
8Bent or damaged outer tube
8Damaged fork spring
8Bent or damaged damper rod
8Incorrect oil viscosity
8Incorrect oil level
8-4
TRBL
SHTG