I bought an '01 dual sported XR650r recently and have ridden it about 100 miles. It has an edelbrock but I have no manual etc. for the carb. Yesterday, it sputtered and hesitated when I rolled on the throttle going down the road at mid to high rpm-sort of like when you are running out of gas. It also backfires mildly but steadily when I'm off the throttle coasting down hill. I think it might be running rich? I'm not sure and I don't know much about carburation. Any advise would be greatly appreciated-got to get ready for Moab this weekend.