Yamaha YFM660FS, Supplementary Service Manual

Page: 474 / 478

10 - 4
TRBL
SHTG
FAULTY GEAR SHIFTING/
FAULTY CLUTCH PERFORMANCE
FAULTY GEAR SHIFTING
HARD SHIFTING
Refer to “CLUTCH SLIPPING/DRAGGING-CLUTCH DRAGGING”.
SHIFT LEVER DOES NOT MOVE
Shift shaft
●
Bent shift shaft
Shift cam, shift fork
●
Groove jammed with impurities
●
Seized shift fork
●
Bent shift fork guide bar
Transmission
●
Seized transmission gear
●
Jammed impurities
●
Incorrectly assembled transmission
Shift guide
●
Broken shift guide
JUMPS OUT OF GEAR
Shift shaft
●
Improperly adjusted shift lever position
●
Worn shift shaft lever
●
Improperly returned stopper lever
Shift fork
●
Worn shift fork
Shift cam
●
Improper thrust play
●
Worn shift cam groove
Transmission
●
Worn gear dog
FAULTY CLUTCH PERFORMANCE
ENGINE OPERATES BUT MACHINE WILL NOT MOVE
V-belt
●
Bent, damaged or worn V-belt
●
V-belt slips
Primary pulley cam and primary pulley slider
●
Damaged or worn primary pulley cam
●
Damaged or worn primary pulley slider
Transmission
●
Damaged transmission gears
CLUTCH SLIPPING
Clutch spring
●
Damaged, loose or worn clutch shoe spring
Clutch shoe
●
Damaged or worn clutch shoe
Primary sliding sheave
●
Seized primary sliding sheave
POOR STARTING PERFORMANCE
V-belt
●
V-belt slips
●
Oil or grease on the V-belt
Primary sliding sheave
●
Faulty operation
●
Worn pin groove
●
Worn pin
Clutch shoe
●
Bent, damaged or worn clutch shoe