Yoshimura · RS-9
The Yoshimura SOUND INSERT KIT RS-9 Muffler, 1.250" is a replacement low-volume insert kit designed for use with RS-9 mufflers. It’s intended for riders who need an optional insert solution when different sound restrictions are required, with decibel reduction varying by application.
This kit is listed for CFMOTO PAPIO-SS 2024–2025, Honda CRF250R 2014, 2018–2021, Honda CRF250RX 2020–2021, Honda CRF450R 2013–2015, Honda GROM 2022–2026, and KTM RC390 2015. For exact application matching, review the fitment table on the page and confirm details using the insert chart.
Built as a replacement low-volume insert kit for RS-9 mufflers, this setup is intended to help tailor exhaust sound output for specific applications. Yoshimura notes that decibel reduction depends on the application, making it important to confirm the correct pairing for the intended motorcycle and muffler configuration.
This kit is offered as an optional solution for applications requiring different sound restrictions. It provides a straightforward way to configure an RS-9 muffler with a low-volume insert tube, depending on the requirements of the specific vehicle and use case.
The insert kit includes the low-volume insert tube, an end-cap collar, and a set screw. As a service and replacement part in Yoshimura’s Replacement Service Parts line, it’s suited for maintaining or reconfiguring an RS-9 muffler without changing the overall muffler system.
Sound
Yoshimura positions this as a replacement low-volume insert kit specifically for RS-9 mufflers. It’s intended to support riders who need an optional insert on applications where different sound restrictions may apply. Because sound output changes by motorcycle and configuration, Yoshimura indicates that the level of decibel reduction depends on the application.
Fitment
This insert kit is listed for CFMOTO PAPIO-SS 2024–2025, Honda CRF250R 2014, 2018–2021, Honda CRF250RX 2020–2021, Honda CRF450R 2013–2015, Honda GROM 2022–2026, and KTM RC390 2015. To ensure the correct match, consult the fitment information on the page and verify the specific application using the insert chart referenced by Yoshimura.
Installation
For added convenience, an installation PDF is provided on the page to support proper setup. The kit’s included pieces are the low-volume insert tube, end-cap collar, and set screw, helping keep the installation focused on the parts required for this RS-9 low-volume insert configuration.
| Part Number | INS-RS9B-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-9 |
| Shipping Weight | 0.35 lb |
| Barcode | 00840025908826 |
| Make | Model | Model Years |
|---|---|---|
| CFMOTO | PAPIO-SS | 2024–2025 |
| Honda | CRF250R | 2014, 2018–2021 |
| Honda | CRF250RX | 2020–2021 |
| Honda | CRF450R | 2013–2015 |
| Honda | GROM | 2022–2026 |
| KTM | RC390 | 2015 |
Fitment as listed by Yoshimura for part number INS-RS9B-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
