Yoshimura · RS-4
The Yoshimura SOUND INSERT KIT 2M-MAX for RS-4 mufflers is a replacement low-volume insert kit designed to help meet different sound restriction needs on select applications. This kit is intended for use with Yoshimura RS-4 mufflers and is offered as an optional solution where an alternate sound insert setup is required.
Fitment includes Honda CRF450R 2011–2012, KTM 450SX-F 2012–2014, KTM 450SX-F-FACTORY-EDITION 2012, Suzuki RM-Z250 2010–2014, Suzuki RM-Z450 2008–2014, Suzuki RMX450Z 2010–2011, and Yamaha YZ450F 2010–2013. Decibel reduction depends on application; reference the insert chart and the fitment table on the page to confirm the correct match.
Sound
Designed as a 2-METER MAX replacement low-volume insert kit for RS-4 mufflers, this Yoshimura set provides the components needed to configure an RS-4 with a lower-volume insert setup when an application calls for different sound restrictions.
Installation
This kit is specified as Non-Spark Arrested. That detail is important when selecting an insert for a particular use case, so riders can choose the correct configuration for their application requirements before installation.
Included
The kit includes a low-volume insert tube, an end-cap collar, and a set screw. These pieces work together as a service replacement set for the RS-4 muffler insert assembly to support proper placement and retention.
Sound
Part of Yoshimura Replacement Service Parts, this RS-4 series insert kit is intended for riders who need a 2M-MAX low-volume insert configuration or a direct replacement for an existing insert setup. It is offered as an optional kit for applications that require different sound restrictions, helping owners keep their RS-4 muffler configured appropriately for their specific motorcycle and use.
Fitment
This insert kit is listed for specific Honda, KTM, Suzuki, and Yamaha models and model years; confirm the exact application using the fitment table and the insert chart referenced on the page. Because decibel reduction depends on application, expected sound change will vary by model. An installation PDF is provided on the page to guide the install process with the correct procedure for the RS-4 muffler setup.
| Part Number | INS-2M28-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4 |
| Shipping Weight | 0.45 lb |
| Barcode | 00840025908802 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2011–2012 |
| KTM | 450SX-F | 2012–2014 |
| KTM | 450SX-F-FACTORY-EDITION | 2012 |
| Suzuki | RM-Z250 | 2010–2014 |
| Suzuki | RM-Z450 | 2008–2014 |
| Suzuki | RMX450Z | 2010–2011 |
| Yamaha | YZ450F | 2010–2013 |
Fitment as listed by Yoshimura for part number INS-2M28-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
