I come here all of the time for advice on my Grizzly. I have never had to post anything because the answer is always somewhere here in this forum. This time I can’t find exactly what I am looking for. So, here is what I got. I have an 04 660 Grizzly. When I bought it, it had an aftermarket pipe on it that was very loud. Since I bought it for hunting, the loud exhaust was not very practical for me. When I bought it, the stock exhaust came with it so I put it back on. The carburetor had been jetted for the aftermarket pipe but I just left it that way. It still ran good but just a little rich. Over the summer I didn’t ride my grizz much and when hunting season came around the carburetor was gummed up. I thought that since I was going to pull it off to clean it, that this would be a great time to put the factory jets back in. I ordered a stock jet kit and put it in after cleaning the carb. Here is where my trouble started. When I put everything back together and turned the gas on fuel started coming out of the overflow tube after only a few seconds. I tapped on the bowl but it still kept coming. I pulled the carb off and adjusted the floats to the factory setting and put it back on. Problem solved, no more overflow. I put the choke on and started it up. After about 10-15 seconds I turned the choke off and it sat there and idled great. I put it in gear and as I started to take off it spit and sputtered and quit. I started it back up and let it idle a minute and it was fine. I tried to take off and it sputtered and backfired and quit again. The next time I tried this, as I was trying to take off I pulled the choke about a third of the way on and kind of “feathered” the throttle and it started to go. As long as I stayed “in the throttle” in ran great. As soon as I would let out of the throttle and just try to maintain my speed it would start backfiring and sputtering terribly. If I got back into the throttle easy and then continued accelerating it ran great again. When I would let off I got the same thing again. Also, when I would come to a stop, if I didn’t turn the choke back off, it would quit. So here is what I have. It only idles with the choke off. It will only accelerate with the choke about a third of the way on. If you are trying to maintain a speed and not accelerate it backfires and spits and sputters terribly. If you try to accelerate without the choke it backfires and sputters. Any ideas?