First of all.. my english is not the best..
I have recently bought an puch maxi s 1979 model (i think its a 1979 model). I have allot of fun driving it. Ofcourse i had to clean it and it was really necessary, it also needed a new piston and some other new stuff. I also cleaned the exhaust which had allot of coal blocking the airflow. The thing is... its got no power whatsoever, it goes about 40 km/h (24 mph) and when trying to go up hill i have to step in myself to be able to get to the top. I think the engine is a 50cc, i really dont know too much about the engine. I already read the performance tab bit it really wasnt to much of a help, hope one of y'all can help me. I gladly appreciate it!
Edit: the picture below was before the cleaning.. still looks same cuz of the rust. (edited)