yamaha 4 stroke choke/backfiring

[ajgolf]

Hey guys. I am new to the golf cart world. I recently picked up an older 4 stroke yamaha golf cart. it sat for 5 years. so it backfires and the choke cable was broke. we put a cable from a bicycle on it for a temporary fix. Saturday when it was warm outside I finally got to get it going. But I had to pull on the cable slightly every once and awhile to keep it going. The motor would run but it wouldn't go. So after I bumped the cable and it got warm it ran for hours. but it is also backfiring. I took the carb out and cleaned it up and that didn't help. I also changed the oil and added a little sea foam to the gas and added fresh gas. otherwise it runs fine. so my question is where do I start to correct these issues. yesterday it was colder outside and it didn't want to go so I just quit. when I get home today im going to try to find the numbers on it to see exactly what kind it is. any help will be much much appreciated.