2002-2006 Yamaha YFR450FAR Service Manual LIT-11616-16-01, Page 213Get this manual
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MIDDLE GEAR
Shims are supplied in the following thicknessMiddle drive pinion gear shim Thickness (mm) 0.10 0.15 0.20 0.30 0.40 0.50
find shim thickness "B" use the following