Basic Kit for Improving the Performance of GX390s, 420 Predators, 13/15 HP Chinese OHVs. Simple to Install and Provides Significant Performance Increases!

Basic Kit for Improving the Performance of GX270 & 270/301cc OHVs. Simple to Install, You Can Expect Significant Performance Increases!

Basic Kit for Improving the Performance of GX160, GX200s, and Chinese 6.5 Engines. Simple to Install, You Can Expect Significant Performance Increases!

Basic Kit for Improving the Performance of 212 Hemi Predator Engines. Simple to Install, You Can Expect Significant Performance Increases.

Basic Kit for Improving the Performance of 208 DuroMax Engines. Simple to Install, You Can Expect Significant Performance Increases!

Basic Kit for Improving the Performance of 212 OHV Predators (Old Style). Simple to Install, You Can Expect Significant Performance Increases.

Basic Kit for Improving the Performance of 224 Predator Engines. Simple to Install, You Can Expect Significant Performance Increases.

A Step up from the Stage 1, This Kit Is Designed to Further Improve the Power of GX240s and GX270s by Adding a Larger Carb and Cam.

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

Special Kit Designed to Improve the Performance of 208cc Duromax Engines Used in Marine Applications, Including Mud Motors, Mud Skippers, Long Shafts, Mokais, etc.

Special Kit Designed to Improve the Performance of 224cc Predator Engines Used in Marine Applications, Including Mud Motors, Mud Skippers, Long Shafts, Mokais, etc.

Maximum Performance without Opening up the Case! Same as Our Stage 1 Kit, but Also Includes Bored Carb and Performance Cam to Produce a Solid 12+ HP on GX200s & 6.5 OHVs.

For Maximum Performance without Opening up the Case! Same as Our Stage 1 Kit, but with the Addition of a Bored Carb and Performance Cam to Produce a Solid 12+ HP on 208s.

For Maximum Performance without Opening up the Case! Same as Our Stage 1 Kit, but with the Addition of a Bored Carb and Performance Cam to Produce in Excess of 12 HP.

For Maximum Performance without Opening up the Case! Same as Our Stage 1 Kit, but with the Addition of a Bored Carb and Performance Cam to Reach 12+ HP.

For Maximum Performance without Opening up the Case! Same as Our Stage 1 Kit, but with the Addition of a Bored Carb and Performance Cam to Produce 12+ HP.

Now You Are Getting Serious! A Step up from Our Stage 2 Kit, We Add a Racing Camshaft, a 22mm Carburetor, and a Billet Rod. This Kit Produces 13-15HP or More.

Now You Are Getting Serious! A Step up from Our Stage 2 Kit, We Add a Racing Camshaft, a 22mm Carburetor, and a Billet Rod. This Kit Produces 13-15HP or More.

Now You Are Getting Serious! A Step Up from Our Stage 2 Kit, We Add a Cam and a Choice of Carburetors. A Billet Rod and All Necessary Gaskets Are Also Included. HP Will Range between 11 and 15, Depending on Cam/Carb Selected.

Now You Are Getting Serious! A Step Up from Our Stage 2 Kit, We Add a Cam and a Choice of Carburetors. A Billet Rod and All Needed Gaskets Are Also Included. HP Will Range between 11 and 15, Depending on Cam/Carb Selected.

Now You Are Getting Serious! A Step up from Our Stage 2 Kit, We Add a Racing Camshaft, a 22mm Carb Kit, and a Billet Rod. Produces 13-15HP or More.

Now You Are Getting Serious! A Step up from Our Stage 2 Kit, This Is Designed to Improve the Power and Durability of GX240s and GX270s.

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 Stage 4+ Kit Allows You to Customize a Kit for Your Application. Similar to That of the Stage 3 Kit, but Adds a Ported and Milled Head, Stainless Valves, Billet Rockers, and a Serious Cam Package. This Kit Will Allow You to Build a Motor in Excess of 20+ HP!

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 Stage 4+ Kit Allows You to Customize a Kit for Your Application. The 4+ Kit Starts with Package Similar to That of the Stage 3 Kit, but Adds a Ported and Milled Head, Stainless Valves, Billet Rockers, and a Serious Cam Package.

Our Stage 4+ Kit Allows You to Customize a Kit for Your Application. Similar to That of the Stage 3 Kit, but Adds a Ported and Milled Head, Stainless Valves, Billet Rockers, and a Serious Cam Package. This Kit Will Allow You to Build a Motor in Excess of 20+ HP!

Our Stage 4 Kit Allows You to Customize a Kit for Your Application. Similar to That of the Stage 3, but Adds a Ported and Milled Head, Stainless Valves, Billet Rockers, and a Serious Cam Package. This Kit Will Allow You to Build a Motor in Excess of 20+ HP!

Our Stage 4+ Kit Allows You to Customize a Kit for Your Application. Similar to That of the Stage 3 Kit, but Adds a Ported and Milled Head, Stainless Valves, Billet Rockers, and a Serious Cam Package. This Kit Will Allow You to Build a Motor in Excess of 20+ HP!

For Building a Serious a GX270 or 301! Similar to That of the Stage 3 Kit, but Adds a Ported and Milled Head with Stainless Valves, Stud Kit, and Heavy Duty Valve Train Components.