Poor Medium-And-High-Speed Performance; Engine; Fuel System; Faulty Gear Shifting - Yamaha XV1600A1999 Service Manual

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE/

FAULTY GEAR SHIFTING/FAULTY CLUTCH
EAS00848
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE
Refer to "STARTING PROBLEMS".

ENGINE

Air filter (See page 3-7 and 3-29)
S Clogged air filter element
EAS00850

FAULTY GEAR SHIFTING

SHIFTING IS DIFFICULT

Refer to "CLUTCH DRAGS".

SHIFT PEDAL DOES NOT MOVE

Shift shaft (See page 5-74 to 5-76)
S Incorrectly adjusted shift rod
S Bent shift shaft.
Shift drum and shift forks (See page 5-122
to 5-127)
S Foreign object in a shift drum groove
S Seized shift fork
S Bent shift fork guide bar
Transmission (See page 5-122 to 5-127)
S Seized transmission gear
S Foreign object between transmission gears
S Incorrectly assembled transmission
EAS00851

FAULTY CLUTCH

CLUTCH SLIPS

Clutch (See page 5-60 to 5-73)
S Incorrectly assembled clutch
S Incorrectly adjusted clutch cable
S Loose or fatigued clutch spring
S Worn friction plate
S Worn clutch plate
Engine oil (See page 3-20 to 3-21)
S Incorrect oil level
S Incorrect oil viscosity (low)
S Deteriorated oil

FUEL SYSTEM

Carburetor (See page 6-1 to 6-20)
S Faulty diaphragm
S Incorrect fuel level
S Loose or clogged main jet
Fuel pump (See page 7-46 to 7-50)
S Faulty fuel pump

JUMPS OUT OF GEAR

Shift shaft (See page 5-74 to 5-76)
S Incorrect shift pedal position
S Incorrectly returned stopper lever
Shift forks (See page 5-122 to 5-127)
S Worn shift fork
Shift drum (See page 5-122 to 5-127)
S Incorrect axial play
S Worn shift drum groove
Transmission (See page 5-122 to 5-127)
S Worn gear dog

CLUTCH DRAGS

Clutch (See page 5-60 to 5-73)
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 Match marks not aligned
Engine oil (See page 3-20 to 3-21)
S Incorrect oil level
S Incorrect oil viscosity (high)
S Deteriorated oil
8-3
TRBL
SHTG