Benzhou 4 Stroke retro china Scooter Dethrottle and make it Faster (60km/h)

The Benzhou china retro scooter was running but not good at all. With throttle full open and higher rpm it nearly died and was going like 30km/h. So I decided to make it faster and remove the limiters. Figured out that these scooters have a screw in the carburetor cap which limits the throttle or the opening stroke of the needle body.
After removing said screw the scooter still ran like before. On high rpms the engine died and it felt like not enough fuel was getting to the cylinder. So I looked up which main jet size was installed (78) and ordered sizes 85 + 90.
After installing the 85 main jet and checking the carb float level the scooter runs perfectly.

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