I picked up a 77 puch maxi (W/1 speed) yesterday riding on flats hit about 25mph or so, down hill about 30mph. Then any sort of incline it would bog to the point I had to wait her get off and push or pedal it. As far as engine mods go it has a delorto carb which a I rejetted to a 60. I was riding with a buddy whose motobecane 50v with similar mods blew me away. Just looking for a starting point on how to get it running properly.
Some ideas I've had are
Should also note that when on the stand it revs to about 7-8k or so and sounds like the motor may have been jugged but not sure