Poor Medium-And-High-Speed Performance; Engine; Fuel System; Faulty Gear Shifting - Yamaha XVZ13TF 1999 Service Manual

EAS00849

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE

Refer to "STARTING PROBLEMS".

ENGINE

Air filter
S Clogged air filter element
S Air intake system
S Bent, clogged or disconnected carburetor air
vent hose
S Clogged or leaking air duct
EAS00850

FAULTY GEAR SHIFTING

SHIFTING IS DIFFICULT

Refer to "CLUTCH DRAGS".

SHIFT PEDAL DOES NOT MOVE

S Shift shaft
S Improperly adjusted shift rod
S Bent shift shaft.
S Shift drum and shift fork(-s)
S Foreign object in the shift drum groove
S Seized shift fork
S Bent shift fork guide bar
Transmission
S Seized transmission gear
S Foreign object between transmission gears
S Improperly assembled transmission
EAS00852

FAULTY CLUTCH

CLUTCH SLIPS

S Clutch
S Improperly assembled clutch
S Improperly assembled clutch master cyinder
S Improperly assembled clutch release cylin-
der
S Incorrect clutch fluid level
S Damage clutch hose
S Loose or fatigued clutch spring
S Loose union bolt
S Worn friction plate
S Worn clutch plate
S Damage clutch release cylinder
Engine oil
S Incorrect oil level
S Incorrect viscosity (low)
S Deteriorated oil
TROUBLESHOOTING

FUEL SYSTEM

Carburetor(-s)
S Faulty diaphragm
S Incorrect fuel level
S Loose or clogged main jet
Fuel pump
S Faulty fuel pump

JUMPS OUT OF GEAR

Shift shaft
S Incorrect shift pedal position
S Improperly returned stopper lever
Shift fork(-s)
S Worn shift fork
Shift drum
S Incorrect axial play
S Worn shift drum groove
Transmission
S Worn gear dog

CLUTCH DRAGS

S Clutch Air in hydraulic clutch system
S Unevenly tensioned clutch springs
S Warped pressure plate
S Bent clutch plate
S Swollen friction plate
S Bent clutch push rod
S Damaged clutch boss
S Burnt primary driven gear bushing
S Damaged clutch release cylinder
S Match marks not aligned
Engine oil
S Incorrect oil level
S Incorrect viscosity (high)
S Deteriorated oil
9-3
TRBL
SHTG