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: $101.00
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 2 Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 2

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: $148.00
Hop Up Kit - 420 Hemi Predator, Stage 3 Hop Up Kit - 420 Hemi Predator, Stage 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: $343.00
Hop Up Kit - GX390 and 13/15hp OHV, Stage 3 Hop Up Kit - GX390 and 13/15hp OHV, Stage 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: $377.00
Hop Up Kit - 420 Hemi, Stage 4 Hop Up Kit - 420 Hemi, 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: $926.00
Hop Up Kit - 414, 420 OHV, & 15hp Clones, Stage 4 Hop Up Kit - 414, 420 OHV, & 15hp Clones, 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: $971.00
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: $1,016.00