Yamaha F400A 2022 - Checking the Pinion; Checking the Forward Gear; Checking the Drive Shaft; Checking the Lower Case

Drive shaft and lower case (regular rotation model)
8-30
When heating the lower case, heat the en-
tire installation area evenly. Otherwise, the
paint on the lower case could be burned.
b. Remove the needle bearing “1”.
TIP:
• Before removing the needle bearing, make
sure to remove the forward gear assembly.
• Before installing the special service tool,
make sure that the rollers are installed in the
needle bearing outer race.
Checking the pinion
1. Check:
• Teeth of the pinion
Cracked/worn → Replace.
Checking the forward gear
1. Check:
• Teeth and dogs of the forward gear
Cracked/worn → Replace.
Checking the drive shaft
1. Check:
• Drive shaft
Damaged/worn → Replace.
2. Measure:
• Drive shaft runout
Above specification → Replace.
Checking the lower case
1. Check:
• Lower case
Cracked/damaged → Replace.
Assembling the lower case
1. Install:
• Needle bearing “1”
TIP:
• Make sure to face the bearing identification
mark “a” on the needle bearing toward the
pinion.
• The needle bearing contains 22 rollers.
Driver rod LL “2”
90890-06605
Needle bearing attachment “3”
90890-06967
Driver rod LL “2”
YB-06605
2
3
3
2
1
Runout
1.0 mm (0.039 in) (F400ASTU,
F400ASTX, F450AVTU,
F450AVTX)
New