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Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1 Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1

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

  • Race/Open Air Filter & Adapter,
  • HD Valve Springs
  • Offset Timing Key,
  • Main Jet for application (see Notes)
  • Pilot Jet
  • Choke Hold Down Bracket
  • Optional Header/Exhaust
  • Optional Carbs (includes insulators)

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

Our Price: $58.99