Home > Hop Up Kits > GX390, GX340, 420 Predator, & 11 hp up Chinese OHV > Stage 4
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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: $968.00
Hop Up Kit -  Honda GX390s, Stage 4 Hop Up Kit - Honda GX390s, 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: $1,031.00
Hop Up Kit - 420 Predator OHV & 13/15hp Clones, Stage 4 Hop Up Kit - 420 Predator OHV & 13/15hp 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: $1,033.00