Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools. For adjusting valve clearance on twin-cam models. Holds valve spring bucket down so adjusting shims can be removed. Manufactured from hardened alloy steel. Same design as the O.E.M. tool. Detailed Specifications: Replaces Yamaha tool YM-01245. Notes: For applications and proper use of this tool please reference your factory Yamaha service manual. Will NOT Fit: Yamaha XZ550, XVZ1200 / 1300, FJ1100 / 1200, XT250L, XT / TT350.