Cool stuff. I'm a 56 year old, reliving my 15 year old self. Great restore on the Puch. I got the same model, year, color I bought new at 15. 78 Puch Maxi Sport in pearl green. Course, they are like chips, so I had to get a second, so I have a matching 80, so friends and family can join me. Working on restoring them both to good operation. No fancy paint jobs at this point. I like the vintage look.
People ask me all the time where to get one, and I tell them "The eighties" LOL.
Great job, but you should be hitting some better numbers with that kit. I live on a steep hill, so understand your gearing concerns.