Yoshimura · RS-4
The Yoshimura Sound Insert Kit 94db for RS-4 mufflers is a replacement low-volume insert solution designed for riders who need a quieter RS-4 setup on supported applications. This kit is listed for Honda CRF250R 2010–2013 fitment (see the fitment table below).
Offered as an optional kit for situations where different sound restrictions apply, it provides a low-volume insert configuration with application-dependent decibel reduction. This insert is non-spark arrested, and it’s intended specifically for RS-4 mufflers using a 1.500" insert size.
Built for Yoshimura RS-4 mufflers, this kit is a replacement low-volume insert option for compatible setups. It’s intended for riders who want an alternate sound configuration on supported applications rather than changing the complete muffler system.
Yoshimura lists this insert kit as an optional solution for applications that require different sound restrictions. Because results vary by application, the actual decibel reduction depends on the specific bike and setup.
The kit includes the low-volume insert tube along with the end-cap collar and set screw. These parts are designed to work together as a service replacement insert assembly for the RS-4 series muffler.
Sound
This Yoshimura Replacement Service Parts insert kit is designed specifically for RS-4 mufflers and provides a low-volume insert configuration in a 1.500" size. It’s positioned as a practical option when a different sound restriction is needed on a compatible application, while keeping the RS-4 muffler in place.
Yoshimura identifies this as a non-spark arrested insert kit. Sound reduction is application dependent, so results can vary based on the bike and overall configuration. For confirmation of the correct insert for a specific application, Yoshimura advises referencing the insert chart.
Fitment
This insert kit is listed to fit Honda CRF250R 2010–2013. For installation guidance, the product page includes an installation PDF link when provided by the manufacturer. Always confirm the correct application using the fitment information shown on the page before installation.
| Part Number | INS-17-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 0.4 lb |
| Barcode | 00840025914278 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF250R | 2010–2013 |
Fitment as listed by Yoshimura for part number INS-17-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
