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Basic kit for improving the performance of GX390s, 420 Predators, 13/15 hp Chinese OHVs. Simple to install, you can expect significant performance increases.
Stage 1 Kit includes
Picture for reference only and may show optional parts. See above description for actual content. Header not included unless specified.
Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included click here
Billet Aluminum flywheel recommended. Stock flywheels, esp "Clone" are prone to failure and very DANGEROUS
Note: UT2s series Hondas (2012 & up) have Rev Limited coils and will require a new coil to exceed 4000 rpm. The UT2 coils (4 wire) can only be used with stock flywheels or 6693 ARC flywheels. If using any other Flywheels, you must run a UT1 style coil (single wire). Most 390 “clone”, 420s, and 460s have UT1 style coils already (However some Lifans and 420s have a rev-limited digital ignition)
If you are unsure of which kit is need, check your STOCK main. If stock main is a :
#92 thru 97, use a UT1 kit,
#98 thru #102 use a Hemi Kit’
>102, Use a UT2 kit
As step up from the Stage 1, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.
Includes
Race/Open Air Filter & Adapter
The 3 kit starts with package similar to that of the stage 2 kit but adds a Ported and Milled Head with stainless, stainless valves, stud kit, & HD valve train components.
