Bearing And Oil Seals; Transmission Installation - Yamaha YTZ250S 1986 Service Manual

2. Check the shift cam grooves for signs of
wear or damage. If any profile has ex-
cessive wear and/ or any damage, replace
cam.
3. Check the cam followers on each shift
fork for wear. The follower should fit
snugly into its seat in the shift fork, but
should not be overly tight. Check the ends
that ride in the grooves in the shift cam.
If they are worn or damaged, replace.
\
4. Carefully inspect each gear. Look for signs
of obvious heat damage (blue discolora-
tion). Check the gear teeth for signs of
pitting, galling, or other extreme wear.
Replace as required.
5. Check to see that each gear properly
engages its counterpart on the shaft.
Check the mating dogs for rounded
edges, cracks, or missing portions. Re-
place as required.
Bearings and Oil Seals
1. After cleaning and lubricating the bear-
ings, rotate inner race with a finger. If
rough spots are noticed, replace the
bearing.
3-30
NOTE: ______________________ _
Bearing(s) are most easily removed or install-
ed if the cases are first heated to approximately
90
0
-120°C (194
0 -
248°F). Bring the case up
to proper temperature slowly. Use an oven.
2. Check oil seal lips for damage or wear.
Replace as required.
3. Always replace crankshaft oil seals
whenever the crankshaft is removed .
4. Install bearing(s) and oil seal(s) with their
manufacturer marks or numbers facing
outward. Before installation, apply grease
to oil seal lip(s) and bearing(s).
Transmission Installation
1 . Mesh the shift fork # 1 with the 6th wheel
gear and # 3 with the 5th wheel gear on
the drive axle. Mesh the shift fork #2 with
the 3rd/4th pinion gear on the main axle.
Install the shift cam assembly on the left-
side crankcase.
1. Shift fork
#
1 2. Shift fork #2 3. Shift fork #3
NOTE: ________________________ _
Install the each shift forks with the embossed
mark should face upward.