HOT Cams 4287-1E Camshaft - Exhaust - Stage 1 - for Yamaha

• Stage 1 is designed for low end torque
• 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.

Improved throttle response with low to mid rpm power increase and minimal bottom end loss.

Includes auto-decompression mechanism.

Exhaust Valve Lash: 0.220 mm.