u/AstronautOne8384

ok so i recently bought this bike for $250 from fb marketplace, and he said he was selling it because of problems it had and that he wasnt much of a mechanical guy and he said he built it all weird, but the only reason im here is because he said there was this one problem that concerned me, he said “So when I’m riding it and twist the throttle, it’ll go, but it doesn’t accelerate like it normally should. Around half throttle, it’ll only go about 10 mph until I let off the throttle and twist it harder. Then the engine gets louder and it actually starts going. Also, the chain will sometimes come off when I twist it harder.” i dont really know what he means about that, im planning on riding on it today to see what thats about, and i can tell the chain tension isnt good, and if anyone knows what i could do to make this look cleaner?