Change the gear ratio of your 4 speed Puch engine.

Longer 1st gear, 11:32 for all Puch 4-speed engines The step from first to second gear is crucial for acceleration in a four-speed engine, and is far too large in the original gearbox. Puch realized this and installed in some later models like the X50-4 a longer 1st gear, which provides optimal speeds for second gear and thus the best possible acceleration. With this gearbox part you can get the fastest possible acceleration during upshifts.