420/500/520 Primary 60% Reduction

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  • Regular price $750.00


This is our 60% billet gear reduction for foot-shift and standard ES machines. Our stiffer stage 2 clutch springs are necessary with this size reduction. The stock clutch springs do not provide enough clamping force to hold the extra torque produced from the lower input ratio.

*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. 


**Our 420-520 60% DOES NOT require case modifications/cutting to be installed on fuel injected models. 2005-2011 Foreman 500 will require case mods.

*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.