Inspection; Assembly; Track Adjustment - Yamaha BR250F Service Manual

B. Inspection
1. Check the track and clips for cracks,
damage, or wear. Replace the track or
clips as required.
2. Inspect the sprockets. If the lugs are
excessively worn, replace the sprockets.
3. Inspect the axle. If it is bent, excessively
scratched, or if the splines or threads are
damaged, replace the axle.
4. When pressing the sprockets onto the
axle, be sure the lugs on each sprocket
are opposite one another as shown in the
photograph. Locate each sprocket on the
axle whsre shown in the illustration.
2. Install the axle. Push the threaded end
up towards the secondary sheave, then
install the splined end into the chain
case. Be sure the lugs correctly engage
the track.
3. Install the bearing and the bearing cage
onto the drive axle. Torque the three
bolts to specification.
Tightening torque:
2.3 m-kg (17 ft-lb)
4. Install the washer and the axle nut.
Torque the nut to specification.
Tightening torque:
8.0 m-kg (58 ft-Ib)
Track deflection: 25,.., 30 mm/10 kg
1.0"" 1.2 in/22 Ib)
5. Install the slide rail suspension. (Refer to
4-8, C
I I
Installation.")
6. Reassemble the chain case, and add oil.
(Refer to 4-6, D "Assernolv.")
D. Track Adjustment
The track tension should be adjusted so that
track deflection will equal specification when
the track is pulled at the middle by a force of
10 kg (22 lb].
178.4 mm
{7.1 in}
211.4 mm
(8,5 in)
63mm
(2.5 in)
138.6 mm
(5.5 in)
105.6 mm
(4.2 in)
~wD\1
~--. .--~
~~~
Turning direction
C. Assembly
1. Place the track in the chassis. Be sure it
is positioned as shown in the illustration.
4-20