Clutch Standard Weight Kit, for TAPP Primary
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Clutch Standard Weight Kit, for TAPP Primary

The weight in the arms of a TAPP primary can be adjusted in two ways: set screws in the arms, and washers on the roller thru bolt. Your clutch was shipped with a basic tuning kit. As with all other clutches, add weight to lower RPM, remove weight to raise RPM. Set screws in the arms affect the low-speed shift points more than the high speed and will reduce the max RPM. Weight on the roller axle bolt acts like tip weight in a conventional clutch, affecting the high-speed more than any other part of the curve. Adjust this as needed for your application. 


  • Eight (8) 1/2 inch Allen screws
  • Four (4) 1-1/2" Roller Bolts
  • Four (4) 1-3/4" Roller Bolts
  • Four (4) 2" Roller Bolts
  • Four (4) Nylon Nuts
  • 16 regular washers


IMPORTANT - As with all other adjustments, do this evenly and only in pairs across from each other, failure to do so will result in an imbalance of the clutch and possible failure.


Allen screws must be added in pairs opposite to one another. Allen screws are .500”, weighing 2.7 grams. Adding two Allen screws will add 5.2 grams. Adding all eight Allen screws will add 20.8 grams.


This product is exempt from the emission standards and related requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and/or federal noise or emission standards/regulations. Purchasers who/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition/racing vehicles as interpreted under applicable state and/or federal law. Questions: Call Evolution Powersports at (715) 247-3862.
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