Yoshimura · RS-4
The Yoshimura SOUND INSERT KIT RS-4 Muffler (1.375 in dia.) is a replacement low-volume insert kit designed for Yoshimura RS-4 mufflers. It’s intended for riders who need an optional insert setup for applications that require different sound restrictions, with decibel reduction varying by application.
This non-spark arrested kit is supplied as a service replacement and includes the key components needed to add or replace the insert hardware on an RS-4 muffler. Refer to the insert chart on the page to confirm the correct application before installation, and use the included installation PDF for guidance.
Built specifically for RS-4 mufflers, this kit centers around a low-volume insert tube intended to change sound output for applications that call for different sound restrictions. Because results depend on the specific application, the actual decibel reduction can vary.
This insert kit is non-spark arrested. It is intended as a replacement or optional low-volume insert solution for RS-4 mufflers where a non-spark arrested configuration is appropriate for the rider’s specific application requirements.
The kit includes the essential pieces needed to service the insert assembly on an RS-4 muffler: the low-volume insert tube, an end-cap collar, and a set screw. This makes it a straightforward option when replacing worn or missing insert components.
Sound
As part of Yoshimura’s Replacement Service Parts line for the RS-4 series, this sound insert kit is aimed at maintaining or adjusting an existing muffler setup rather than replacing the entire exhaust. It’s offered as an optional kit for applications that require different sound restrictions, helping riders configure an RS-4 muffler to suit their specific needs while keeping the parts matched to the RS-4 platform.
Installation
Fitment can vary by application, so it’s important to verify the correct insert selection before installation. Use the insert chart shown on the page to confirm the appropriate match, then follow the installation PDF for proper assembly.
| Part Number | INS-24-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 0.45 lb |
| Barcode | 00840025908819 |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
