Yokomo S4-300RRA Aluminum Rear Suspension Mount - Race Tuned  [S4-300RRA]

Upgrade Your YZ-4S Rear End with the Yokomo S4-300RRA

The Yokomo S4-300RRA Aluminum Rear Suspension Mount is a purpose-built upgrade for the YZ-4S, replacing the original resin bush to unlock a wider range of rear alignment settings. Machined from durable aluminum, this mount increases chassis stability and helps maintain consistent handling during race runs.

Benefits of an Aluminum Rear Mount

Aluminum parts are prized for their balance of strength and weight, giving racers a reliable option that resists flex without adding excessive mass. The S4-300RRA lets you dial in precise suspension geometry for improved cornering and lap-to-lap repeatability.

Fitment and Simple Installation

This rear suspension mount fits multiple Yokomo chassis, including the B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020. Installation is straightforward and uses existing mounting points, so you can swap in the aluminum mount with basic hand tools and minimal setup time.