Middle Gear Shim Selection - Yamaha YFM250XL(C) Service Manual

MIDDLE GEAR SERVICE
8.Inspect:
Bearing housing 1
Cracks/Damage → Replace bearing hous-
ing assembly.
O-ring 2
Wear/Damage → Replace.
NOTE:
When the bearing housing assembly is
replaced, be sure to adjust the middle gear
shim(s), refer to the "MIDDLE GEAR SHIM
SELECTION" section.

MIDDLE GEAR SHIM SELECTION

Install the crankcase, middle gears and mid-
dle driven shaft by using shim(s) with their
respective thickness(es) calculated from the
numbers specified on the following parts.
Crankcase
Drive pinion gear
Driven pinion gear
Reverse gear
Bearing housing
Middle driven shaft
Be sure to adjust the middle gear shim(s),
when the following parts replaced.
Crankcase
Drive pinion gear
Driven pinion gear
Reverse gear
Bearing housing
Middle driven shaft
6 - 9
DRIV
6