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It will help with acceleration, as it keeps the motor in the heart of the RPM range before letting the CVT shift out.

Also when driving fast and hitting an incline, it will backshift quicker and let you get up the hill easier
 

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The orange spring is the best one for the 660...even bone stock...

The bigger the tires the more you benefit...

Better climbing, better back-shifting, better engine-braking, better grip on belt...

You can go as stiffer than orange to compensate large tires but you start to lose acceleration...
 

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What about the 450. Anyone have any experience with that. I will be adding the Hotrod sheave soon. What about the spring.
 
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