Hot Cams Stage 2 Racing Camshaft 4166-2EX for 2010-2013 Yamaha YZ450F

WE RACE ON THE TRACK, NOT THE DYNO! Most camshaft designs are developed only on a dyno. Good camshaft designs not only increase power, they also improve throttle response. However, more power and better throttle response is a difficult design problem. Hotcams’ ITR technology solved this dilemma through highly engineered opening ramps not found on other cams. Using ITR technology, the critical ramp area is designed to give your engine a cleaner intake charge and a more efficient combustion cycle, making your engine more responsive at all throttle openings and giving the rider better feel and control of the engine! You will notice the difference!

The Hot Cams Stage 2 Racing Camshaft is engineered for riders who demand stronger engine response and race-focused performance from their Yamaha YZ450F. Manufacturer part number 4166-2EX, also identified by vendor part number 4166-2EX, this high-performance camshaft uses Hot Cams Improved Throttle Response (ITR) technology to optimize the critical opening-ramp area. The result is a cleaner intake charge, a more efficient combustion cycle, and sharper response across the throttle range.

Unlike camshaft designs developed solely for dyno power, the Hot Cams Stage 2 profile is designed to improve both power delivery and rider control on the track. Its racing-oriented design helps the engine respond more quickly to throttle inputs, giving the rider improved feel during acceleration and transitions. The camshaft is intended for use with stock valve springs and rockers in most applications, helping simplify installation while maintaining compatibility with the factory valvetrain components.

Fitment includes the 2010, 2011, 2012, and 2013 Yamaha YZ450F. No core is required. This camshaft is designed for racing applications and is not legal for use in California on pollution-controlled vehicles; California use is limited to racing applications, with a waiver available where applicable. Verify engine configuration and installation requirements before fitting.

Features:

• Stage 2 high-performance racing camshaft for Yamaha YZ450F applications
• Hot Cams Improved Throttle Response (ITR) technology
• Designed to improve throttle response, engine feel, and track performance
• Engineered opening ramps promote a cleaner intake charge and efficient combustion cycle
• Designed to use stock valve springs and rockers in most applications
• No core required
• Adjustable cam sprockets supplied with some models
• Fits 2010-2013 Yamaha YZ450F
• Manufacturer and vendor part number: 4166-2EX
• Race use only in California on pollution-controlled vehicles; waiver available

Fitment:
2010 Yamaha YZ450F
2011 Yamaha YZ450F
2012 Yamaha YZ450F
2013 Yamaha YZ450F