Yamaha BR250F Service Manual page 48

2. Install the bushing and the spider into
the sliding sheav'e. Be sure the bottons
correctly engage the slider.
3. Thread the sliding sheave onto the fixed
sheave.
4. Install the cams. Be sure they are
correctly seated in the sliding sheave.
5. Install the spring and the sheave cap. Be
sure the /IX" on the sheave cap aligns
with the JlX" on the sliding sheave.
6. Install the primary sheave subassembly
tool and secure the sheave cap to the
fixed sheave. The two long bolts must
also secure the clutch cams in place.
Torque all six bolts to specification.
Primary sheave subassembly tool:
90890·01858
Tightening torque:
1.0 m-kq (7 ft-Ib)
7. Check the movement of the sliding
sheave. If it is not smooth, disassemble
the primary sheave and reassemble it
correctly.
4-7
8. Clean the tapered portions of crankshaft
and fixed sheave.
9. Fit the fixed sheave to the tapered por-
tion of crankshaft.
10. Apply engine oil to the threaded portion
of primary sheave bolt and its contact
su rface with spri ng washer.
11. Hold the primary fixed sheave with the
primary sheave holder, and torque the
sheave bolt to specification.
Primary sheave holder:
TLS-90018-80-00 (U.S.A.)
90890-01701
Tightening torque:
Tighten the bolt to A to properly seat
the primary sheave on the crankshaft.
Loosen the bolt, then torque it to B, the
final torque.
A: 10 m-kq (72 ft-lb)
B: 5.8 m-kg (42 ft-lb)