Top drivers like Mark Pavidis and Atsushi Hara can vouch for the victory-taking technology of O.S. Speed engines. Both have stood in the IFMAR Off-Road World Championship winner’s circle as a result of its powerful edge. Now another O.S. engine offers you the same advantage with the new O.S. Speed 21XZ-B engine. The O.S. 21XZ-B engine has a completely new design that delivers instant throttle response and impressive torque over the entire rpm range.