4289 2E Camshaft Exhaust Stage 2 Yamaha YFZ450R 2012 2025

Features: Stage 2 is designed for mid to top end gains. Adds a 5%-10% power gain. Designed and dyno proven in the USA. Manufactured by utilizing state of the art valvetrain software. CNC machined from 8620 billet, case-hardened steel for an exact fit and lobe profile. Engineered to be drop-in cams, that use stock valve springs (unless otherwise noted).. Select cams feature Hot Cams Improved Throttle Design (ITR) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-end.. For dual cam engine.. Mid to top end rpm power increase and minimal bottom end loss. Designed with I.T.R. technology. Includes auto-decompression mechanism. Exhaust Valve Lash: 0.220 mm..