Yoshimura · RS-4
The Yoshimura SOUND INSERT KIT 94db for RS-4 mufflers is a replacement low-volume insert kit designed to help meet different sound restrictions, depending on the application. Built for Yoshimura RS-4 setups, it provides an optional insert solution when a quieter configuration is needed.
This kit is listed for Honda CRF450R 2011–2012 and Yamaha YZ450F 2014 (see the fitment table below). It includes the low-volume insert tube, end-cap collar, and set screw to restore or adjust the muffler’s insert hardware without replacing the full muffler.
Designed specifically as a replacement low-volume insert kit for Yoshimura RS-4 mufflers. It’s intended for riders who need an optional insert setup on applications that call for different sound restrictions, with results that vary by application.
This insert kit is non-spark arrested. For riders selecting components to match riding areas and event requirements, this detail is important when choosing between insert options and confirming the correct configuration for a specific application.
The kit includes the low-volume insert tube along with the end-cap collar and set screw. These parts support proper installation and retention of the insert within the RS-4 muffler end-cap assembly when replacing worn or missing components.
Sound
Part of Yoshimura’s Replacement Service Parts line, this RS-4 series insert kit is aimed at maintaining or updating an RS-4 muffler with the correct insert-style components. It’s positioned as an optional kit for applications that require different sound restrictions, helping riders configure an RS-4 muffler to suit their specific needs rather than replacing major components.
Fitment
Yoshimura identifies this as a 94db sound insert kit and notes that decibel reduction depends on the application. Because sound output can vary by model and setup, confirming the correct insert selection for the intended bike is essential. Reference the page’s insert fitment resources and the fitment table to ensure the insert is matched to the correct RS-4 muffler application.
Installation
This insert kit is listed for Honda CRF450R 2011–2012 and Yamaha YZ450F 2014. Fitment should be verified before installation using the fitment information shown on the page. An installation PDF is provided on the product page to support a straightforward install of the insert tube, end-cap collar, and set screw.
| Part Number | INS-16-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 0.45 lb |
| Barcode | 00840025914261 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2011–2012 |
| Yamaha | YZ450F | 2014 |
Fitment as listed by Yoshimura for part number INS-16-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
