So I have a gokart with what I believe is an engine going bad, I can get it to start and it will run for half a tank and then die. I had replaced the carb, then the pull start went south. I am looking for a replacement engine that is pretty much a direct drop in. My current engine is a Tecumseh powersport 6HP with a max torque converter on it and the only identifying marks on the kart are BTK Charger. Can anybody point me in the right direction I wouldn't mind a little more power also. I am attaching some photos.