Yamaha 2003 YZ450FR Owner's Service Manual page 203

TRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4801
Shift fork, shift cam and segment
1. Inspect:
Shift fork 1
G
Wear/damage/scratches → Replace.
2. Inspect:
Shift cam 1
G
Segment 2
G
Bend/wear/damage → Replace.
3. Check:
Shift fork movement
G
Unsmooth operation → Replace shift
fork.
NOTE:
For a malfunctioning shift fork, replace not only
the shift fork itself but the two gears each adja-
cent to the shift fork.
ASSEMBLY AND INSTALLATION
Transmission
1. Install:
4th pinion gear (20T) 1
G
3rd pinion gear (18T) 2
G
2nd pinion gear (16T) 3
G
To main axle 4.
NOTE:
Apply the molybdenum disulfide oil on the
G
2nd and 5th pinion gears inner circumfer-
ence and on the end surface.
Apply the molybdenum disulfide oil on the
G
3rd pinion gear inner circumference.
4 - 96
ENG