Mugen V2 Gkp

While specific dyno sheets vary by build, a typical comparison on a Honda GX200 with a mild cam (e.g., .265 lift), 24mm carb, and header pipe shows:

Furthermore, the torque curve with the Mugen piston stays flat from 4,000 to 7,000 RPM, whereas the stock piston torque falls off a cliff after 6,000 RPM. This "area under the curve" is where the Mugen wins races. mugen v2 gkp

The Graphics Kit Patch (GKP) is a set of modifications and enhancements for Mugen V2, focusing on graphical improvements. GKP aims to: While specific dyno sheets vary by build, a

Stock cast pistons have a critical flaw: at RPMs above 6,000, they begin to distort (rock) in the bore. The forged Mugen piston, thanks to its tighter cold clearances and superior rigidity, allows the engine to safely rev to 9,000-10,000 RPM (with supporting valvetrain modifications). Furthermore, the torque curve with the Mugen piston

The original "V1" GKP used a different ring thickness (0.8mm top ring) which was incredibly fragile and allowed excessive oil blow-by. The V2 changed the top and second ring to 1.0mm thickness. This made the piston more durable for amateur racers and endurance events, though slightly heavier than the V1. The V2 also features revised wrist pin oiling holes to better lubricate the small end bearing under high load.