Home > Hop Up Kits > GX340, GX390, 420 Predator, & 13/15hp 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 Significant Performance Increases!

Our Price: $34.88
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

A Step up from the Stage 1, This Kit Is Designed to Improve the Power and Durability of GX340s and GX390s.

Our Price: $154.00
Hop Up Kit, 420 Hemi Predator, Stage 3 Hop Up Kit, 420 Hemi Predator, Stage 3

Now You Are Getting Serious! A Step up from Our Stage 2 Kit, This Will Further Empower the 420, Producing up to 20+ HP.

Our Price: $329.00
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: $360.00
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: $960.00
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: $1,028.00
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: $1,029.00