Home > Hop Up Kits > GX390, GX340, 420 Predator, & 11 hp up Chinese OHV
We found 3 results matching your criteria.
Choose a sub category:
Stage 1 Stage 2 Stage 3
Stage 4
Sort By:
Page of 1
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

Our Price: $59.99
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 2/3 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 2/3

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.

Our Price: $449.99
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 4 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 4

The Stage 4 kit starts with package similar to that of the stage 3 but adds a Ported and Milled Head with stainless, stainless valves, stud kit, & HD valve train components. This kist allows up to 35+ HP out of a GX390 and 40+ out of 420/440cc engines.

Our Price: $928.99