GZ250 Backfire after decelration after carb clean

[alantf]

After reading your last post, and with only 180 miles on the bike, my first suggestion would be to handle the bike a lot more gently, and give the engine a good break in period. You're not doing the engine much good, going hell for leather at this early stage.

[Meme]

I think alantf is probably right, you are riding the bike too hard. And remember that the proper idle speed on these bikes is unusually high (1,300 RPMs).

BUT, if the shop owner that "cleaned" the carb thinks you need to run carb cleaner in it (fuel treatment) to fix the problem, I would find another shop to take it to. Carb cleaners you run through the tank are nowhere near as effective as taking the carb apart and cleaning it properly. If the shop doing the work thinks that is the solution, they probably have a long history of improperly cleaning carburetors. There should be nothing to clean out after it has been properly cleaned.