Used by team Yamaha Pro racers; This stabilizer is extremely adjustable and rugged. This Precision Stabilizer was designed for the Yamaha Raptor 250 and comes with all hardware needed for an easy installation and mounts up to your Raptor 250 in approximately 15 minutes; no drilling, welding, or grinding needed. The Pro stabilizer has a built in reservoir to compensate for thermal expansion. The stock steering stem diameter for the RAPTOR 250 is 1.25". All known after market stems will fit.