This is my first post and I hope I can learn something here as I'm kind of without a bike at the moment! I have a 2008 Honda XR650L that is cutting out when I apply throttle at around 25 mph and up. The bike has an FMF Jet Kit, a Big Gun Exhaust, and a less restrictive air filter. I did not do any other modifications and I didn't grind off the little plate on the carb in order to have more adjustment on my mixture screw. I was running regular gas in it but at the advice of the guy that just worked on it I run premium gas in it now and I'm still on my first tank of that. I hadn't ridden the bike in a while so I took it to a local shop and had them clean the carb, change the oil, and give it a state inspection. I went and picked it up and it started right up and sounded great. I went to take it home and everything seemed fine for the 1/2 mile trip. The next day (yesterday) I went to ride it to work, which is only two miles away, and when I was going about 35 mph I throttled it and the bike started cutting out like it was not getting fuel and wanting to die. It felt like I was tapping the front brakes a bit. Now I seem to remember having a similar problem once when I took the bike from very South Louisiana to very North Alabama. The bike ran fine at low speeds but when I started up into the thirties it wanted to cut out and sputter. I adjusted the mixture screw on the bottom of the carb and it went away. I tried doing that when I got to work and it didn't make the problem go away. It does seem to lessen the problem when I moved the screw all the way to the left side (driver's side if on a car) and up against the little plate that sticks off the bottom of the carburetor. Some other things I'm noticing is a lot of excessive popping on deceleration. Once it begins to cut out I just let off the gas and it stops. I called Wild West Honda, in Katy Texas, and they wanted to charge me $170 to look at and "adjust" the carburetor. Not including parts of course. Since I just paid the registration, inspection, and mechanic fees to this other guy I'd like to avoid that. I'm hoping you guys can walk me through stuff to check to diagnos and fix this. I should note that the bike did sit a while but was running fine before and nothing changed mechanically between the last time I rode it (about a year ago) and now other than now running premium in it. We did drain all the old fuel out of the tank before running it. So that's where I'm at right now. I'm hoping this is easily fixable by myself. I'm very mechanically inclined but this is my first bike so I'm new to working on them.