Yoshimura · RS-2
The Yoshimura SOUND INSERT KIT 94db RS-2 Muffler, 1.375" (INS-11-K) is a replacement low-volume insert kit designed for Yoshimura RS-2 mufflers. It’s intended for riders who need an optional insert setup on applications that call for different sound restrictions, with decibel reduction depending on the specific application.
This kit is listed for Honda CRF450R 2007–2008, Honda XR150L 2023–2026, Suzuki RM-Z450 2005–2007, and Yamaha WR125R 2026 (see the fitment table below). It is a non-spark arrested insert solution, making it a focused service-part option for RS-2 owners looking to tailor sound output within their application’s requirements.
Built as a replacement low-volume insert kit for RS-2 mufflers, this setup is intended to help manage sound levels where different sound restrictions apply. Yoshimura notes that decibel reduction depends on the specific application, so results can vary by model and configuration.
This insert kit is specified as non-spark arrested. For riders selecting components for their RS-2 muffler, that designation is important when matching the bike’s intended use and local requirements to the correct muffler setup.
The kit includes the key hardware needed for installation: a low-volume insert tube, an end-cap collar, and a set screw. For additional guidance, the page includes an installation PDF link to reference during setup.
Sound
INS-11-K is part of Yoshimura’s Replacement Service Parts product line and is specifically tied to the RS-2 series. Rather than a generic insert, it is positioned as an optional kit for applications that require different sound restrictions, giving RS-2 owners a straightforward way to configure their muffler with a low-volume insert approach.
Fitment
Fitment is provided for Honda CRF450R 2007–2008, Honda XR150L 2023–2026, Suzuki RM-Z450 2005–2007, and Yamaha WR125R 2026. Because insert selection can be application-specific, Yoshimura also advises confirming fitment using the Insert Chart referenced on the page, ensuring the correct match for the intended motorcycle and muffler configuration.
Installation
This kit is supplied as a small set of dedicated parts intended to work together at the muffler end-cap area, including the insert tube, end-cap collar, and set screw. An installation PDF is provided on the page to support correct assembly, helping owners complete the swap or replacement with the proper reference on hand.
| Part Number | INS-11-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-2 |
| Shipping Weight | 0.55 lb |
| Barcode | 00840025908734 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2007–2008 |
| Honda | XR150L | 2023–2026 |
| Suzuki | RM-Z450 | 2005–2007 |
| Yamaha | WR125R | 2026 |
Fitment as listed by Yoshimura for part number INS-11-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
