Yamaha YFM250XL(C) Service Manual page 201

MIDDLE GEAR SERVICE
Example:
1) If the bearing hauging is stamped "–03".
..... j = 1 – 0.03 = 0.97
2) If the crankcase is stamped "45"
..... c = 110 + 0.45 = 110.45
3) If the pinion gear is stamped "–02"
..... k = 14.5 – 0.02 = 14.48
4) If the middle drive shaft is stamped "03"
..... l = 80.5 + 0.03 = 80.53
5) Therefore, shim thickness Î is,
Î = 0.97 + 110.45 – 13.00 – 0.95 – 14.48
– 80.53 – 0.25 = 2.21 mm
6) Shim sizes are supplied in following
thickness:
Thickness (mm)
Because shims can only be selected in
0.10 mm increments, round off hundredths
digit and select appropriate shim(s).
Hundredths
0, 1, 2, 3, 4
5, 6, 7, 8, 9
If the example above, the calculated shim
thickness 2.21 mm. The chart instructs you,
however, to round off the 1 to 0, then shim
thickness is 2.20 mm.
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6 - 15
DRIV
Middle driven
gear shim
1.0 1.1
1.2 1.3
1.4 1.5
1.6 1.7
1.8 1.9
Round value
0
10
6