All the “performance” mods and parts are starting to finally come together for the Gen 1 50cc Maddog 139QMB. A lot of these GY6 mods tend to build on each other and this is a good example. The Polini 95mm Variator that had slowed me down before is now increasing my top speed and my acceleration. All the engine parts on it right now to get this speed total $481.66. I still have the rear end gear up mod and the 21mm PWK left to do as I try and get 55mph. I don’t have links as they constantly go dead, but search these below in the list of parts to find them on Amazon and EBay:

• Naraku 100.52 Big Bore Kit
• 64mm Rocker Arms
• Nibbi PE19
• Nibbi Flange Adapter
• Polini Variator #241.647
• NCY High Performance Cam
• GY6 150cc Aluminum Intake Manifold
• 50mm Cone Air Filter

How to install the 50cc Big Bore Kit:    • The Complete and Definitive Tutorial ...  

How to install the Nibbi Carb:    • Nibbi 19mm PE19 Carburetor on 139QMB ...