Clutch and Drive

Fast Trail Stud & Runner Combo Kits

We have done the R&D and found that the Woody’s 5/16″ mega bite 60 degree carbide studs and backers rock. Couple that with a set of 6″ 60 degree carbide runners and you will have full control. Base kit includes … More Info

Gear and Chain Combo

Let us hand pick you the correct gear ratio so that your SR Viper will perform at it’s best for your riding style. Includes Klotz Black Formula Graphite Lube. You should inspect your primary sheaves and look for witness marks … More Info

Heavy Primary Clutch Tuning Rivets

Schmidt Bros Motorsports’ exclusive, high performance, heavy tuning rivets that are cast right here, in our shop. Add weight in the meat of the power for increased power levels, whether naturally aspirated or boosted. Yamaha makes a range of tuning … More Info

High Performance Replacement Primary Clutch Rollers

Replacement 14.7mm and 15.7mm primary clutch rollers. These exclusive SBM rollers are the same ones that are used in our clutch kits.  The outer roller shells are Rockwell 70 hardened material and are slightly wider than the factory rollers.  This … More Info

Primary Clutch Overdrive Machining

Send us your primary clutch and we will modify it to give you an additional 4-5mph on top end with out sacrificing low end and mid-range performance. More Info

Quiet Clutch Shim Kit

These specialty anti-rattle roller and flyweight shims greatly reduce unwanted noise & wear in the primary clutch. Noise will be decreased by 75% and wear to the clutch spider is all but eliminated.

Secondary Helix Overdrive Machining

Send us any factory or aftermarket secondary helix and we will machine it to give you an additional 5mph on the top end without effecting your low end and mid-range performance whatsoever. Parts Shipping Form (Opens in a new window)

SR-Viper EZ-Off Belt Guard Bracket

This EZ-Off Clutch Guard Bracket was made to allow you easier access to the belt and clutches. The factory permanently rivets the clutch guard in place. This makes it almost impossible to replace a belt on the trail. Although this … More Info

SR-Viper Torque Monster Clutch Kits

Low engagement doesn’t mean low power anymore! SR Viper Comfort Clutch Kit: The SR-Viper Comfort Clutch kit is for the dreaded higher engagement in these models. This kit offers a 2,800 RPM engagement which is 1,200-1,400 RPM’s lower then the … More Info