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The sheave is a part of a variable width pulley that changes the ratio for the belt on the CVT. By having it machined like KMS and RhinoCrap do they allow the belt to ride lower for quicker take off and higher for more top end speed. The change is made because the sheave holds weights that move out with centrifical force. The machineing allows them to travel further.

Beware I have heard of Yamaha checking belt wear marks on sheaves during warranty claims.
 

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Chandler said:
The sheave is a part of a variable width pulley that changes the ratio for the belt on the CVT. By having it machined like KMS and RhinoCrap do they allow the belt to ride lower for quicker take off and higher for more top end speed. The change is made because the sheave holds weights that move out with centrifical force. The machineing allows them to travel further.

Beware I have heard of Yamaha checking belt wear marks on sheaves during warranty claims.
So it enhances performance, does it make the belt wear faster ? why would it void your warranty ?
 

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I only know one person who had a catastrophic engine failure and had an extended warranty. The sheave wear was one of many points Yamaha was using to deny warranty. The warranty claim thing is always about finding a way out if something major happens.

I have not heard about any extra belt wear issues.
 
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