Yamaha YFM250XL(C) Service Manual page 225

FINAL DRIVE GEAR AND DRIVE SHAFT
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3.Adjust:
Gear lash
*********************************
Gear lash adjustment steps:
Select the suitable shims and thrust
washer by the following chart.
Too-little gear lash →
Reduce shim thickness.
Too-large gear lash →
Increase shim thickness.
To add or reduce ring gear shim
thickness
Increase by more
than 0.1 mm
(0.004 in)
Reduce thrust
washer thickness
by 0.1 mm
(0.004 in) for every
0.1 mm of ring
Ring gear shim
Thickness (mm)
Thrust washer
Thickness (mm)
*********************************
4.Install:
Thrust washer 1
Ring gear 2
Shim(s) 3
Bearing housing 4
Refer to the "FINAL DRIVE GEAR AND
DRIVE SHAFT – ASSEMBLY" section.
DRIV
Reduce by more
than 0.1 mm
(0.004 in)
Reverse
procedure
0.25 0.30 0.35
0.40 0.45 0.50
1.2 1.7 2.0
1.4 1.8 2.1
1.6 1.9
6