420/500/520 Primary 20% Reduction

  • Sale
  • Regular price $650.00

This is our 20% billet gear reduction for foot-shift and standard ES machines. This reduction DOES NOT require crankcase modification/cutting to be installed. We offer stiffer stage 1 clutch springs that can be used with this reduction. Pic may not show correct size.

*Add our "420/500/520 Master Kit" to your order to get everything necessary for a professional headache free install. The master kit is for the do-it-yourselfer and includes ALL the recommended extra parts. Includes stage 1 clutch springs, front output shaft seal, gasket maker and centrifugal clutch puller. The master kit can be found under the 420-520 sections and the "Parts" section of the website. 


*ES models will need an ES module to prevent electronic shift issues. Springs, ES modules and seal kits are located in the 420/500/520 sections and "Parts" section of the site.