Faulty Gear Shifting - Yamaha XV16AL Service Manual

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE/
EAS00848
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE
Refer to "STARTING PROBLEMS".
ENGINE
Air filter (See page 3-7 and 3-29)
• 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)
• Incorrectly adjusted shift rod
• Bent shift shaft
Shift drum and shift forks (See page 5-122
to 5-127)
• Foreign object in a shift drum groove
• Seized shift fork
• Bent shift fork guide bar
Transmission (See page 5-122 to 5-127)
• Seized transmission gear
• Foreign object between transmission
gears
• Incorrectly assembled transmission
EAS00851
FAULTY CLUTCH
CLUTCH SLIPS
Clutch (See page 5-60 to 5-73)
• Incorrectly assembled clutch
• Incorrectly adjusted clutch cable
• Loose or fatigued clutch spring
• Worn friction plate
• Worn clutch plate
8
Engine oil (See page 3-20 to 3-21)
• Incorrect oil level
• Incorrect oil viscosity (low)
• Deteriorated oil
FAULTY GEAR SHIFTING/FAULTY CLUTCH
FUEL SYSTEM
Carburetor (See page 6-1 to 6-20)
• Faulty diaphragm
• Incorrect fuel level
• Loose or clogged main jet
Fuel pump (See page 7-46 to 7-50)
• Faulty fuel pump
JUMPS OUT OF GEAR
Shift shaft (See page 5-74 to 5-76)
• Incorrect shift pedal position
• Incorrectly returned stopper lever
Shift forks (See page 5-122 to 5-127)
• Worn shift fork
Shift drum (See page 5-122 to 5-127)
• Incorrect axial play
• Worn shift drum groove
Transmission (See page 5-122 to 5-127)
• Worn gear dog
CLUTCH DRAGS
Clutch (See page 5-60 to 5-73)
• Unevenly tensioned clutch springs
• Warped pressure plate
• Bent clutch plate
• Swollen friction plate
• Bent clutch push rod
• Damaged clutch boss
• Burnt primary driven gear bushing
• Match marks not aligned
Engine oil (See page 3-20 to 3-21)
• Incorrect oil level
• Incorrect oil viscosity (high)
• Deteriorated oil
8 - 3
TRBL
SHTG