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: $35.15
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: $175.00
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: $351.00
Hop Up Kit, GX390 & 13/15hp OHV, Stage 3 Hop Up Kit, GX390 & 13/15hp OHV, Stage 3

A Step up from the Stage 2, This Kit Is Designed to Improve the Power for GX340s and GX390s along with Improving the Durability.

Our Price: $382.00
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: $971.00
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: $1,030.00
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: $1,085.00