11-18 FINAL DRIVE
Bearing Housing Bearing Inspection
Do not remove the bearings for inspection. Re-
moval may damage them.
Inspect the ball bearing [A] and needle bearing [B] in-
stalled in the bearing housing.
The rollers and balls in a bearing normally wear very little,
and wear is difficult to measure. Instead of measuring,
visually inspect the bearing for abrasion, discoloration, or
If the needle bearing and rear axle [C] show any signs of
abnormal wear, discoloration, or damage, replace them
as a set.
Turn the ball bearing in the bearing housing back and forth
[A] while checking for plays, roughness, or binding.
If bearing play, roughness or binding is found, replace the
Examine the bearing seal [B] for tears or leakage.
If the seal is torn or is leaking, replace the bearing.
Sprocket Wear Inspection
Visually inspect the engine and rear sprocket teeth for
wear and damage.
If the teeth are worn as illustrated, replace the sprocket,
and inspect the drive chain wear (see Drive Chain Wear
Inspection in the Periodic Maintenance chapter).
Worn Tooth (Engine Sprocket) [A]
Worn Tooth (Rear Sprocket) [B]
Direction of Rotation [C]
If a sprocket requires replacement, the chain is proba-
bly worn also. When replacing a sprocket, inspect the
Rear Sprocket Warp Inspection
Raise the rear wheel off the ground with the stand so that
it will turn freely.
Set a dial gauge [A] against the rear sprocket [B] near the
teeth as shown, and rotate [C] the rear wheel to measure
the sprocket runout (warp). The difference between the
highest and lowest dial gauge readings is the amount of
If the runout exceeds the service limit, replace the rear
Rear Sprocket Warp
TIR 0.4 mm (0.016 in.) or less
Service Limit: TIR 0.5 mm (0.020 in.)