I have a Edelbrock carb on my XR650R for about 4 or 5 months now with no problems until this week. I started my bike and was warming it up like it ran out of fuel. I started it again only it died sooner. I checked the fuel from the tank side and it was flowing just fine. Since a while back I had this same problem only it was water in the fuel tank that blocked the fuel screen in the tank. That was my first assumption this time. Now it will not start at all. I hooked a long fuel line directly to the carb and tried to blow into the carb. I couldn't blow at all it acted like it was plugged. So I have come to 2 possible conclusions. 1) There is a fuel filter or screen built inside the carb which is plugged not letting any fuel by. 2) The bowl is full and the float and needle are preventing me from blowing into the carb. This would mean that my fuel pump is not working. a) My only problem with this thought is that the bike died while I was holding the rpm up to about 1500 rpm. I didn't think the pump was necassary to keep the bike running at the rpm. It acted like the bowl went dry and wasn't getting anymore fuel. I guess I won't know for sure till I tear it down. Anyone else have any ideas. I guess I could install my stock carb and be on the road in a matter of hours. I don't want to do that unless there is no choice.