Fitment
RS-4D Top Outlet Fit
Checking the fitment information and insert chart is recommended to confirm the correct application.
Yoshimura · RS-4D
The Yoshimura RS-4D Sound Insert Kit INS-TA-K is a replacement low-volume insert kit designed for RS-4D mufflers that use the top outlet end-cap configuration. It’s intended for riders who need an optional insert setup for applications that require different sound restrictions, with decibel reduction varying by application.
This kit is listed for Honda CRF450R 2011–2012 and Suzuki RM-Z450 2008–2014 (see the fitment table below). It is a non-spark arrested insert kit and is supplied as a service/optional component within Yoshimura’s Replacement Service Parts line.
Fitment
Checking the fitment information and insert chart is recommended to confirm the correct application.
Sound
This kit is described as a low-volume insert solution for RS-4D mufflers. Yoshimura notes that decibel reduction depends on the specific application, making it a practical option when different sound restrictions need to be addressed for a given setup.
Included
The INS-TA-K package includes the low-volume insert tube along with an end-cap collar and set screw. As a Replacement Service Parts offering, it’s suited for replacing a worn or missing insert assembly or setting up an optional insert arrangement on supported applications.
Sound
Yoshimura positions the INS-TA-K as a replacement low-volume insert kit for RS-4D mufflers, intended for the top outlet end-cap layout. It’s offered as an optional kit on applications that may require different sound restrictions, giving riders a straightforward path to configure or restore the muffler’s insert setup using the correct components.
This insert kit is specified as non-spark arrested. Yoshimura also states that decibel reduction depends on the application, so results can vary by model and configuration. For confirmation of the correct insert selection for a given setup, reference to the insert chart is recommended.
Fitment
Fitment for this Yoshimura RS-4D sound insert kit is listed for Honda CRF450R 2011–2012 and Suzuki RM-Z450 2008–2014. Use the fitment table below to verify the listed models and years before ordering, and consult the installation PDF shown on the page for guidance during installation.
| Part Number | INS-TA-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-4D |
| Shipping Weight | 0.35 lb |
| Barcode | 00840025917637 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2011–2012 |
| Suzuki | RM-Z450 | 2008–2014 |
Fitment as listed by Yoshimura for part number INS-TA-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
