I bought this from my 2012 WR250F. The way the carb sits, you can't get to the end of the stock fuel screw without twisting the carb. The fuel screw is recessed about an inch into the carb, so you need something at least that long to get to it. Bit the carb sits so close to the engine that you can't fit a small screwdriver in. Adjustment was tedious. This fuel screw is fantastic. There's no reaching under the carb to adjust it like with the other aftermarket screws. The bend of the cable keeps it from rotating on its own. You can also use the logo on the end of the knob to count how many turns out the screw is. This thing is great. It took 15 minutes to put on, and most of that was getting the old fuel screw out.