Hey all.... picked up a 1976 CB200t in "running condition". I have no license yet so the owner rode it back and forth for me....all seemed well, stayed idling, shifted through all gears, no smoke or engine noise....$900 seemed reasonable. Friend ride it home for me but it wouldn't stay idling. He thought it was needing just a throttle adjustment.then on the ride home we had to ascend a pretty good hill.... quickly lost power and struggled to keep it at 35 in 3rd gear....and smoke began coming from underneath. so I looked it up and the troubleshooting section of a book I have and it said that it probably has a top-end problem or maybe even with rings and pistons. So first I think it already but I wonder if there is an opinion if I got duped or not and second how much work am I looking forward to? Should I delve in this myself or dish out some cash, which I'm short of?