Yoshimura · RS-4
The Yoshimura SOUND INSERT KIT RS-4 Muffler, 1.500" RING (INS-23-K) is a replacement low-volume insert kit designed specifically for Yoshimura RS-4 mufflers. It’s intended for riders who want an optional insert solution for setups that call for different sound restrictions, with decibel reduction varying by application.
This kit is listed as non-spark arrested and is offered within Yoshimura’s Replacement Service Parts line. For proper application, confirm fitment using the insert chart shown on the page, and reference the included installation PDF for guidance before installation.
Built as a replacement low-volume insert kit for RS-4 mufflers, this Yoshimura set is intended to restore or add an insert option without guessing on sizing. The 1.500" ring specification helps identify the correct style for the RS-4 configuration it’s designed for.
Yoshimura lists this kit as an optional insert solution for applications that require different sound restrictions. Because results depend on the specific application, decibel reduction can vary—making it important to verify the correct insert selection for the intended setup.
This kit includes the key parts needed for the insert assembly: a low-volume insert tube, an end-cap collar, and a set screw. It’s a straightforward way to replace worn or missing components while keeping the RS-4 muffler configured with a low-volume insert.
Sound
INS-23-K is part of Yoshimura’s Replacement Service Parts lineup and is aimed at RS-4 muffler owners who need a dedicated low-volume insert kit. Rather than piecing together individual parts, this set provides the matched components called out by Yoshimura for the insert assembly so the RS-4 can be configured with a low-volume insert solution as intended.
Fitment
Yoshimura identifies this as a low-volume insert kit and notes that sound reduction depends on the application. It is also specified as non-spark arrested. To help ensure the correct choice for a particular setup, the page’s insert chart is the reference point to confirm fitment before ordering or installing.
Installation
Because this is an application-dependent service part, verifying the correct insert selection is essential. Use the insert chart on the page to confirm fitment for the intended application, then follow the installation PDF provided on the product page for installation reference. This approach helps ensure the components are used in the correct RS-4 muffler configuration.
| Part Number | INS-23-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 1 lb |
| Barcode | 00840025908796 |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
