At DMG Motorsports, we present the Yoshimura RS-4 Exhaust Spark Arrestor Replacement Part (SA-04-K) — a direct-fit, USFS-approved spark arrestor insert built specifically for Yoshimura RS-4 off-road mufflers. Whether your factory-equipped RS-4 system needs a fresh replacement insert or you're adding spark arrestor capability to an application that wasn't originally equipped with one, this genuine Yoshimura kit keeps you compliant on forest service land while preserving the performance character of your RS-4 exhaust. Backed by Yoshimura's engineering and precision manufacturing, this insert is the trusted choice for riders who demand OEM-level fit and reliability.

Features:

• Genuine Yoshimura replacement spark arrestor insert designed specifically for RS-4 off-road mufflers
• USFS (U.S. Forest Service) approved for legal trail and forest riding
• 1.5" diameter insert with 1.75" O.D. and 1 7/16" I.D. for precise RS-4 muffler fitment
• Available as an optional spark arrestor for applications not originally equipped with one
• Kit includes spark arrestor insert, end-cap collar, and set screw for complete installation
• Compatible with a wide range of RS-4 applications across Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, and GasGas off-road models
• Straightforward bolt-on installation using OEM-style hardware
• Manufacturer part number SA-04-K, Yoshimura SKU 961-9027

Fitment