Yamaha RS90K Service Manual page 136

SECONDARY SHEAVE
Installation steps:
• Hold the spring seat 1 and turn the fixed
sheave 2 counterclockwise to the specified
angle a.
NOTE:
The holes in the spring seat should align with the
bolts on the sliding sheave.
a = (sheave hole number + spring seat hole
number) × 10
Twist angle:
60° (RS90/RS90R/RSG90/RST90
"USA/Canada")
70° (RS90M/RST90 "Europe"/
RST90TF)
• Push down on the spring seat until the bolts
come through the holes.
• While pushing down on the spring seat, install
the nuts and tighten them to the specified
torque.
Spring seat nut:
23 Nm (2.3 m · kg, 17 ft · lb)
4. Measure:
• Secondary sheave clearance a
Out of specification → Adjust.
Secondary sheave clearance:
35.0 ~ 35.8 mm (1.38 ~ 1.41 in)
5. Calculate:
• Shim thickness
NOTE:
For example, if the clearance is 36 mm (1.42 in),
install a 0.5 mm (0.02 in) shim on each bolt so the
clearance is 35.5 mm (1.40 in).
6. Adjust:
• Secondary sheave clearance
4-14
POWR
TR