I have an old lawn tractor that I just got. I think its a 1986 model. I got it all cleaned up, including the carb and air filter. Maybe I didn;t clean the carb well enough. The tractor will only run with the choke on and it backfires A LOT. When I turn the choke off the mower goes off. I think the backfiring problem is a timing problem. Anyone know whats wrong.
Mower info: Craftsman 917 255736
Engine info: craftsman B&S model: 252707, type: 0621-03, code: 36040111