Yamaha RS90GTZ Service Manual page 89

Part
Weight rivet
Roller
Shim
Secondary sheave
Spring
Fixed sheave
Spring seat
Element
Quantity Rivets are fastened through the hole in the weight.
Material • Using more rivets decreases the clutch engage-
(iron, aluminum) ment and shifting speed. Shifting tends to become
somewhat easier. (increasing the sheave thrust)
• Using less rivets increases the clutch engagement
and shifting speed. Shifting tends to become
somewhat harder. (decreasing the sheave thrust)
Outside diameter The outside diameter affects the contact angle with
the weight.
• A smaller diameter decreases the clutch engage-
ment speed. (increasing the sheave thrust)
• A larger diameter increases the clutch engage-
ment speed. (decreasing the sheave thrust)
Quantity • Using more shims increases the preload and
clutch engagement speed.
(increasing the spring reaction force)
• Using less shim decreases the preload and clutch
engagement speed.
(decreasing the spring reaction force)
Preload • A larger preload, spring rate or twist angle
Spring rate increases the shifting speed and makes shifting
(compression, somewhat harder. (increasing the sheave thrust)
torsion) • A smaller preload, spring rate or twist angle
decreases the shifting speed and makes shifting
somewhat easier.
(decreasing the sheave thrust)
Spring fitting hole One of the holes may be used selectively to change
the spring twist angle (preload).
Refer to "
2-66
INSP
CLUTCH
ADJ
Impact on the shifting function
Spring".