4005-2 - Hot Cams Camshaft Stage 2 For Yamaha YFM660R 2001-2005

Features: Computer Numerical Control (CNC) from 8620 billet steel and case harden. Designed and dyno proven in the USA. Engineered by using valvetrain software. Adds a 5%-10% power gain. Select cams feature Hot Cams Improved Throttle Design (I.T.R.) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-end. Designed for mid to top end gains.. Engineered to be drop in cams that use stock valve springs (unless otherwise noted).. Improved mid range and top end power. Uses stock auto-decompression mechanism. For dual cam engine. Requires Hot Cams spring kit. Intake Valve Lash: 0.200 mm. Exhaust Valve Lash: 0.250 mm..