Fox Powersports Factory Series 1.5 Float 3 EVOL R Shocks Pair - Yamaha YFZ450R (2009-2018)
Updated June 23, 2026
This pair of Fox Factory Series 1.5 Float 3 EVOL R shocks is a high-performance suspension upgrade designed specifically for the Yamaha YFZ450R sport ATV (model years 2009–2018). These rear shocks (sold as a pair) are engineered for aggressive riding, offering precise damping control and improved bottom-out resistance through Fox's EVOL R technology. They are part of the Factory Series line, known for race-proven durability and tunability.
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Design and Technology
The Factory Series 1.5 Float 3 EVOL R shocks feature a 1.5-inch diameter aluminum body with a floating piston design. The EVOL R (Evolutionary Volume Large) system uses an external reservoir with a separate air chamber, allowing independent adjustment of spring rate and bottom-out resistance. This enables riders to fine-tune the shock for different terrain and riding styles without changing springs. The Float 3 designation indicates three-way adjustability: high-speed compression, low-speed compression, and rebound damping. The shocks are nitrogen-charged for consistent performance and fade resistance.
Vehicle Fitment
These shocks are a direct-fit replacement for the rear suspension of the Yamaha YFZ450R from 2009 through 2018. They are not compatible with the standard YFZ450 (non-R) or earlier models. The pair includes both left and right rear shocks, designed to match the stock mounting points and dimensions. No major modifications are required for installation, though existing hardware (bolts, bushings) should be inspected and reused or replaced as needed.
Installation Notes
Installation is a straightforward bolt-on procedure for those familiar with ATV suspension work. The vehicle should be securely supported, and the rear wheels removed for access. It is recommended to pre-set the air pressure in the EVOL chamber according to rider weight and intended use before mounting. After installation, the ride height and sag should be checked and adjusted. Torque all fasteners to the manufacturer's specifications (not provided here; consult the service manual). Bleeding air from the shock body may be required if the shocks were stored horizontally.
Common Failure Symptoms
Worn or failing shocks on the YFZ450R typically exhibit excessive bottoming, reduced damping control, leaking oil around the shaft seal, or a bouncy, unstable ride. The EVOL R shocks are rebuildable; if performance degrades, the seals and oil can be serviced. Air leaks from the valve or reservoir can cause a loss of adjustability. Regular inspection for shaft pitting, seal wear, and proper air pressure is recommended to maintain optimal performance.
