Yamaha YZ450F Manuel D'atelier Du Proprietaire page 432

TRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4801
Shift fork, shift cam and segment
1. Inspect:
• Shift fork 1
Wear/damage/scratches → Replace.
2. Inspect:
• Shift cam 1
• Segment 2
Bend/wear/damage → Replace.
3. Check:
• Shift fork movement
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:
• Collar 1
• 4th pinion gear (20T) 2
• 3rd pinion gear (18T) 3
• 2nd pinion gear (16T) 4
To main axle 5.
NOTE:
Apply the molybdenum disulfide oil on the
inner and end surface of the idler gear and on
the inner surface of the sliding gear, then
install.
4 - 96
ENG