Home > Hop Up Kits > GX390, GX340, 420 Predator, & 11 hp up Chinese OHV
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Hop Up Kit; GX340 to GX390, 420 Predator, & 13/15hp OHV; Stage 1 Hop Up Kit; GX340 to GX390, 420 Predator, & 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: $35.32
Hop Up Kit; GX340 to GX390, 420 Predator, & 13/15hp OHV; Stage 2 Hop Up Kit; GX340 to GX390, 420 Predator, & 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: $146.00
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: $342.00
Hop Up Kit, GX390 & 13/15hp OHV, Stage 3 Hop Up Kit, GX390 & 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: $380.00
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: $1,085.00
Hop Up Kit, Honda GX390, Stage 4 Hop Up Kit, Honda GX390, 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: $1,118.00
Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4 Hop Up Kit, 420 Predator OHV & 13/15hp Clone, 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: $1,119.00