X4F aluminum layshaft is strategically CNC-machined to reduce rotating fat without compromising power or integrity. The precision layshaft minimizes runout, eliminating drivetrain vibration and creating an optimistic stability. The layshaft includes two exchangeable bearings to help expand minimize drivetrain vibration. The composite gear pulley key solidly toward layshaft, and also the completed set up is installed onto the engine mountââ¬â¢s metal layshaft axle. Machined from premium Swiss 7075 T6 aluminum and black anodized. Fits X4F