Basic kit for
improving the performance of GX270 & 270/301cc OHVs. Simple to install, you can expect significant performance
increases

Step up from the Stage 1, this kit is designed to further improve the power for the GX240s and GX270s by adding a larger carb and cam.

As step up from the Stage 2, this
kit is designed to improve the power for the GX340s and GX390s along with
improving the durability.

For building a serious a GX270 or
301, the 4 kit starts with package similar to that of the stage 3 kit but adds
a Ported and Milled Head with stainless, stainless valves, stud kit, & HD
valve train components.