4011-1 - Hot Cams Camshaft Stage 1 For Yamaha YFM660R 2001-2005

Features: Designed and dyno proven in the USA. Engineered by using valvetrain software. Adds a 5%-10% power gain. CNC machined from 8620 billet, case hardened steel for an exact fit and lobe profile. 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 low end torque.. Engineered to be drop in cams that use stock valve springs (unless otherwise noted).. Excellent mid-range and top-end power increase. Uses stock valve springs. Uses stock auto-decompression mechanism. For single cam engine. Intake Valve Lash: 0.200 mm. Exhaust Valve Lash: 0.250 mm..