Yoshimura · RS-4
The Yoshimura Low-Volume Insert Kit Works Finish INS-U-2 1.500" RS4 Muffler is a replacement low-volume insert kit designed for Yoshimura RS-4 mufflers. It’s intended for riders who want an optional insert solution for applications that call for different sound restrictions, while keeping the muffler’s RS-4 configuration serviced with genuine Yoshimura components.
This kit is non-spark arrested, and decibel reduction will vary by application. For correct application matching, the insert chart and the fitment resources on the page should be used to confirm compatibility before installation.
Built as a replacement low-volume insert kit specifically for Yoshimura RS-4 mufflers, this service part supports maintaining an existing RS-4 setup with the correct insert-style components. It’s suited for owners refreshing worn parts or setting up the muffler for a different sound restriction requirement.
Yoshimura lists this kit as an optional solution for applications requiring different sound restrictions. Because decibel reduction depends on application, the final result can vary, making it important to confirm the correct configuration for the specific muffler and use case.
The kit includes the low-volume insert tube along with an end-cap collar and a set screw. These parts provide the necessary hardware for installing the insert into the RS-4 muffler as a complete low-volume insert kit assembly.
Sound
This Yoshimura kit is categorized under Replacement Service Parts and is designed around the RS-4 series muffler platform. It’s intended to serve as a low-volume insert option for riders who need a different sound-restriction configuration than their current setup. Since outcomes depend on application, confirming the correct insert selection for the muffler is an important step before installing.
Installation
Because this listing does not specify a make, model, or year fitment set, confirming application is essential before purchase and installation. Yoshimura recommends using the insert chart to verify fitment for the intended application. An installation PDF is provided on the page to guide the install process with the correct steps for this kit.
| Part Number | INS-26-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 1 lb |
| Barcode | 00840025920415 |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
