Poor Braking Performance; Faulty Front Fork Legs; Leaking Oil; Malfunction - Yamaha YZF-R6 99 Service Manual

POOR BRAKING PERFORMANCE/FAULTY FRONT FORK
EB907000

POOR BRAKING PERFORMANCE

S Worn brake pad
S Worn brake disc
S Air in hydraulic brake system
S Leaking brake fluid
S Faulty brake caliper piston seal
EB908001

FAULTY FRONT FORK LEGS

LEAKING OIL

S Bent, damaged or rusty inner tube
S Damaged outer tube
S Incorrectly installed oil seal
S Damaged oil seal lip
S Incorrect oil level (high)
S Loose damper rod assembly bolt
S Damaged damper rod assembly bolt copper
washer
S Damaged cap bolt O-ring
EB909001

UNSTABLE HANDLING

Handlebars
S Bent or incorrectly installed right handlebar
S Bent or incorrectly installed left handlebar
Steering head components
S Incorrectly installed upper bracket
S Incorrectly installed lower bracket
(incorrectly tightened ring nut)
S Bent steering stem
S Damaged ball bearing or bearing race
Front fork legs
S Unevenoil levels (both front fork legs)
S Unevenly tensioned fork spring (both front fork
legs)
S Damaged fork spring
S Bent or damaged inner tube
S Bent or damaged outer tube
LEGS/UNSTABLE HANDLING
S Loose union bolt
S Damaged brake hose
S Oil or grease on the brake disc
S Oil or grease on the brake pad
S Incorrect brake fluid level

MALFUNCTION

S Bent or damaged inner tube
S Bent or damaged outer tube
S Damaged fork spring
S Worn or damaged outer tube busing
S Bent or damaged damper rod
S Incorrect oil viscosity
S Incorrect oil level
Swingarm
S Worn bearing or bushing
S Bent or damaged swingarm
Rear shock absorber assembly
S Faulty rear shock absorber spring
S Leaking oil or gas
Tires
S Uneven tire pressures (front and rear)
S Incorrect tire pressure
S Uneven tire wear
Wheels
S Incorrect wheel balance
S Deformed cast wheel
S Damaged wheel bearing
S Bent or loose wheel axle
S Excessive wheel runout
Frame
S Bent frame
S Damaged steering head pipe
S Incorrectly installed bearing race
9-4
TRBL
SHTG