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Hey all! I am new on here and searched around to see if I could find a solution to my issue. There were a few threads that beat around the bush but I didn't find one that nailed my problem. So here it is (hopefully not again)! I bought a little 250 for my wife and we took it out right after that and it ran great. Came back to the shop, parked it for about a week or two with a few starts in between, and then went out over the weekend and it started cutting out and backfiring into the carb. It seems like the choke was sticking cause it was "loading up" and you'd have to give it a bunch of gas to get it running again. It won't idle while in gear, or in neutral for that matter. It runs for a few seconds and then will backfire and die. There was a bit of smoke that would come out the top of the carb as well. When I'd have it running and in any gear, I'd take it up to about 3-4000 rpms and you could hear it cutting out a bit. No pattern to it, just random cutting out. However, when going through the gears at full throttle it ran fine. I have went through the carb and cleaned up everything as best as possible. There were some o-rings that could have been replaced but didn't have any. I put it back together without the new ones but they are on order. There was one thing of curious note...on the diaphragm on the top of the carb, there is/should be a brass cylinder on the outside of the diaphragm. It is now missing. Will that make the difference? I always thought it was for idle purposes. I know its supposed to be there cause I have saw them plenty on my R6 carbs. (nearly robbed one out of my spare set of carbs) Overall, I'd like some input on why this is happening and what I can do to fix it. Are there any rebuild kits out there worth a crap? Let me know...and sorry for being so long winded!