Home > Hop Up Kits > GX390, GX340, 420 Predator, & 11 hp up Chinese OHV
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Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 1 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 1

Basic kit for improving the performance of GX390s, 420 Predators, 13/15 hp Chinese OHVs. Simple to install and provides a significant performance increases

Our Price: $60.99
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 2.5 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 2.5

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 OHV, Stage 4 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp 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 kits allows up to 35+ HP out of a GX390 and 40+ out of 420/440cc engines.

Our Price: $908.99