My 1980 Puch Maxi would start, idle and rev up quite well when on the center stand, but would quickly Lois power and bog down if I was sitting on it and going for a ride.
I removed and cleaned the exhaust and baffle which was definitely in need of this, but made no difference in the performance. So I removed the carb, disassembled and cleaned it. Though everything seemed fine I found the jet in the bowl to be plugged abit. After opening up the jet, reassembling and reinstalling the carb the bike ran perfectly. I was able cruise up and down the street with good acceleration and no power loss.
I am posting this in hopes that it might help others with similar issues on their bikes and I can’t stress enough how surprisingly simple and straight forward it is to clean a Bing carb.