Home > Hop Up Kits > GX340, GX390, 420 Predator, & 13/15hp Chinese OHV > Stage 4
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Hop Up Kit, 420 Hemi, Stage 4 Hop Up Kit, 420 Hemi, Stage 4

Similar to our Stage 3 Kit, but Adds a Ported and Milled Head with Stainless Valves, a Stud Kit, & HD Valve Train Components. This Kits Allows up to 35+ HP.

Our Price: $946.00
Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4 Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4

Similar to That of the Stage 3, but Adds a Ported and Milled Head with Stainless Valves, a Stud Kit, and HD Valve Train Components. Allows up to 35+ HP from a 420 Engine.

Our Price: $1,175.00
Hop Up Kit, Honda GX390, Stage 4 Hop Up Kit, Honda GX390, Stage 4

Similar to That of the Stage 3, but Adds a Ported and Milled Head with Stainless Valves, a Stud Kit, and HD Valve Train Components. Allows up to 35+ HP Out of a GX390 Engine.

Our Price: $1,180.00
Hop Up Kit, 440 Duromax Hop Up Kit, 440 Duromax

Stage 4 Kit for 440 Duromax, featuring everything from a Ported and Milled Head with Stainless Valves,  Stud Kit, and HD Valve Train Components. Allows up to 35+ HP from a 440 Engine.

Our Price: $1,230.00
Hop Up Kit, 460cc (10-Bolt) Engines Hop Up Kit, 460cc (10-Bolt) Engines

Stage 4 Kit for 460cc 92mm 10-Bolt Engines, featuring everything from a Ported and Milled Head with Stainless Valves,  Stud Kit, and HD Valve Train Components. Allows up to 40 HP from a 460 Engine.

Our Price: $1,244.00