2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 237Get this manual
MIDDLE GEAR
6) Round off hundredths digit and select appropriate shim(s)In the example above, the calculated shim thickness is 0.64 mmThe chart instructs you, however, to round off to 5Hundredths 0, 1, 3, 4, 5, 6, 8, Round value 10
Shims are supplied in the following thicknessMiddle drive pinion gear shim 0.10 0.15 0.20 0.30 0.40 0.50 0.60