04-19 HONDA CRF50F: BBR XR50 Handlebar Kit (Black) The BBR XR50 Handlebar Kit raises the handlebars for adult backyard racing.Stock controls will NOT fit on the standard 7/8" bars supplied with this kit, so this kit comes with all necessary parts including controls.Anodized, CNC-machined billet aluminum t Honda XR / CRF50 handlebars from 3/4" diameter to standard motorcycle / bicycle 7/8". This throttle, cable, and carburetor top are a special design to work with the super short slide of the O.E.M. Keihin 13 mm carb. If you have a larger aftermarket carb, you will need a different throttle and cable (consider BBR's carb kit throttle and cable; sold separately).