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Sportsman 850, Scrambler 850/1000 STM Tuner Secondary Gen 1

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 Product Description

Product Description

 All billet construction capable of using compression springs with adjustable spring rate options. We have many helix angles, see above. We can also provide custom multiple helix angles if you desire for an additional fee.

The dual roller option creates a very consistent smooth up shift and backshift. The encapsulated helix design keeps the driven from unloading, opening and going into high gear during downshifting, breaking and jumping. The use of the helix body to support the movable sheave instead of towers keeps the whole assembly concentric and centered without twisting while under load. This is a tremendous upgrade over the stock driven.

Can be used along with the stock primary or the STM Rage dual speed primary.


When ordering use this guide to help you pick options    

Choose a model – Let us know what you have Sportsman or Scrambler 850.

Number of shims – The amount of shims we install will determine your belt deflection or how tight the belt will be between your primary and driven clutch. Keep in mind we are setting the deflection for a stock belt, for an XP choose 2 shims. Keep in mind the more shims you add the looser the belt -  less shims tighter belt. NOTE: You want to have your belt as tight as possible without the bike creeping forward while in gear at idle.

Choose a helix angle - The most popular helix is the 45°. It’s a good all-around helix we found worked the best for the average to aggressive trail rider.

Choose a spring – The most popular spring is the PS13 gold this spring works well for most average to aggressive trail riders.

Comes with a belt removal tool and uses stock bolt for installation.    

KEEP IN MIND WE CAN ONLY GET YOU CLOSE WITH SET UP. Everyone's riding style is different so it’s up to the customer to do the fine tuning!

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