2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 204Get this manual
MIDDLE GEAR
Example: 1) If the bearing housing is marked "+04", is 10.54, 2) is 55 3) If the crankcase (right) is marked "66.03", is 66.034) Therefore, the shim thickness is 0.47 mmA66.03 10.54 550.49 5) Round off hundredths digit and select appropriate shim(s)In the example above, the calculated shim thickness is 0.49 mmThe chart instructs you, however, to round off to 10Hundredths 0, 1, 3, 4, 5, 6, 8, Round value 10