STM Tuner Secondary Replacement Components

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

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

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...

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

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

The 24FDU558 bushing is a replacement bushing for some STM tuner secondary Dual Spring Caps sku: 1001676 applications. 

Tuner bolt for Polaris 850 tuner application. Includes: 1-M10 x 1.25 x45 mm HHCS 1-M10 lock washer

Tuner bolt for 2011-19 Polaris Rush 880 tuner application. Includes: 1-M10 x 1.25 x55 mm HHCS 1-M10 lock washer

Polaris  850 Retaining Washer for the STM tuner secondary 

Replacement parts for STM Tuner 2001248