2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 366Get this manual
FAULTY GEAR SHIFTING FAULTY CLUTCH PERFORMANCE FAULTY GEAR SHIFTING HARD SHIFTING Refer to "CLUTCH SLIPPINGDRAGGING-CLUTCH DRAGGING"SHIFT LEVER DOES NOT MOVE Shift cam, shift fork Groove jammed with impurities Seized shift fork Bent shift fork guide bar
TRBL SHTG
Transmission Seized transmission gear Jammed impurities Incorrectly assembled transmission Shift guide Broken shift guide
JUMPS OUT OF GEAR Shift fork Worn shift fork
Shift cam Improper thrust play Worn shift cam groove Transmission Worn gear dog