Actually i have a couple of reasons.
First the Batavus i'm picking up is apart,
and secondly i searched the site and found little to performance tune the batavus HS50.
Having said that, i would love to stick a lifan on it, but the frame would be in the way of the carb. so i thought maybe a tomos a35 might fit better and you can be performance parts for it.
Basically i want to build a "little" motorcycle with loads of power.