Since I have owned my Edelbrock carb it has not worked more than 4 1/2 months without major troubles. After owning it for 4 1/2 months the fuel shut off valve started sticking shut not allowing fuel into the fuel bowl. It was intermittant at first and then became the norm for the bike to shut down in the middle of nowhere. I have owned the carb for 1 1/2 years but not enjoyed flawless performance for more than 4 1/2 months at a time. I ended up sending it back to Edelbrock last May and they put a brand new bowl on it and mailed it back to me. I thought it was fixed and the bike ran like a dream for about 4 months and then 1 month ago it started doing the same thing. Today I could not get the fuel valve to come loose and it would not let any fuel into the bowl. The fuel flows freely when you pull the fuel line and turn the valve on but thats as far as it gets. So now I must pull the carb again. Edelbrock obviously doesn't really know whats wrong and got lucky for a few months. Im going back to the stock carb. When I have time I will break down the Edelbrock carb maybe I can find the problem that Edelbrock's top people could not find. This is not an isolated incident since two other TT members have emailed me asking if I ever got the problem resolved. I told them about Edelbrock replacing the bowl (which I never understood as a fix) and that I was happy with the carb. At least one of them mailed his back to Edelbrock and had the same thing done. Now my question to those who have had this problem with the QS Edelbrock carb on a XR650R is: Did any of you finally get the problem permanently resolved? If so what did you do? I'm not seeking comment's from QS fans. I already know what you have to say and I agree with you when the carb works. I want answers not a Edelbrock sales committee.