850 E-Tec

STM HD compression spring helix cover to be used with the KSS style springs, works with HXATV , HXATVG2 and HXSM2S helix's.  ONLY works on secondary's with a 1.500" diameter post.    Comes complete with  Qty 1 - 2408 Bushing for 1...

The spanner tool works with the STM torsional Spring Cover PN1001078    

STM Torsion spring cover option. Allows the use of a torsion spring with the option of 7 spring load adjustments with one spring. No drilling or modifications to the STM Secondary is needed. Does not come with helix or spring...

STM Torsional Spring cover    Fits    All STM Gen 2 snowmobile tuner secondary's that use a torsion spring    All STM Gen 1 ATV Tuner secondary's that use the outer belt deflection adjustment nut...

Replacement reverse Buttons sold individual Fits  All STM Gen 2 Snowmobile Tuner secondary's for 2 stroke machines with reverse        MH3-13-20

STM Gen 2 helix with reverse notch    Fits   All STM Gen 2 Snowmobile Tuner secondary's for 2 stroke machines with reverse        MH3-13-20

Tool to compress the primary clutch to make working on the clutch or making adjustments to the cams arms easier. 

STM Tuner Secondary offset shim for 1" trans shafts .030 thick each. comes in a set of 6 

The 24FDU13 bushing is a replacement bushing for some STM tuner secondary movable sheave applications. 

This is a "Drop in" adjustable cam arm set for the stock "P-Drive" Primary clutch. This kit can be used with the OEM Ski-Doo clicker levers and clicker cam or our billet levers and low wear cam clicker upgrade.  Items included with cam arms listed...

This is a conversion jackshaft to be able to run aftermarket secondary clutches with a 1" dia. post with 1/4" keyway. Fits 2017-2018 850 Etec 

Tuner retaining washer for the keyed shaft STM tuner secondary.