I got to say, one of the best mods I ever did was to change out the vacuum carb on the dr650 with a pumper. It was easy and quick, and the throttle response was loads of fun. The bike would loft the front wheel easy just using the throttle in 1st and 2nd, and sometimes in 3rd. The bike also ran much better (smoother) at lower rpm's, and the reason they use a vacuum carb is only for emissions. I would not give a damn if it reduced the reliability one bit, it was too much fun, plus jetting it right (instructions were spot on) made the motor run cooler. Honda has a commercial out saying there is nothing that could not be better, and its true. If you reduced the power of all bikes 50%, they would ALL last longer.