Inspection; Assembly - Yamaha BR250F Service Manual

2. Using the
3~way
puller, remove the fixed
sheave.
3-Way Puller Ass'y: TLU-90901-05-20 (U.S.A.)
1. 3-Way Puller Body: 90890-01848
2. 3-Way Puller Attachment: 90890-01873
3. Remove the key from the [ackshaft.
4. Very carefully remove the secondary
sheave holder. The spring will force the
sheave out.
5. Remove the sliding sheave, the spring,
and the spring seat. The spring seat has a
left-hand thread. If it is difficult to
remove the spring seat, rap it with a
plastic mallet.
6. Remove the collar and the circlip from
the jackshaft bearing cage.
8. Inspection
1. Inspect both sheaves. If either is warped,
replace it.
2. Inspect the ramp shoes on the sliding
sheave; replace as necessary.
3. Check the sheave bushings for wear;
replace the sheave as required.
4. Check the spring. If it is fatigued or
damaged, replace it.
C. Assembly
1. Install the circlip and collar into the
jackshaft bearing cage.
2. Thread the spring seat onto the jack-
shaft; it has a left-hand th read. The
spring seat must be tight or it will come
loose when you preload the secondary
sheave spri ng.
3. Install the spring into the spring seat. Be
sure the spring is in one of the holes.
NOTE: _
The three holes in the spring seat are for con-
venience only. Seating the spring in a differ-
ent hole will not change the spring preload.
4. Install the sliding sheave onto the jack-
shaft. Be sure the spring engages the hole
in the sheave.
5. Starti ng from the free position, rotate
the sliding sheave clockwise to preload
the spring, and push the sheave towards
the chain case. Lock the sliding sheave in
place with the secondary sheave holder.
Secondary sheave holder:
90890-01872
Preload:
Turning the sliding sheave 1/3 of a
turn from the free position (past one
ramp shoe) sets the spring at 160
0
•
Turning the sliding sheave 2/3 of a
tu rn from the free position (past two
ramp shoes) sets the spring at 280
0
•