Yoshimura · RS-12
The Yoshimura RS-12 Premium Muffler Repack Kit 750G is a replacement service parts kit designed to keep an RS-12 off-road exhaust performing the way it was intended. Yoshimura notes that off-road systems should be repacked after 6-8 hours of use, or after each Race, to help maintain proper airflow and sound quality.
This kit fits Honda CRF250R 2022–2024, Honda CRF250RX 2023–2024, Honda CRF450R 2021–2026, Honda CRF450R-S 2023–2024, and Honda CRF450RX 2020–2026. Fresh packing helps reduce the airflow restriction that can come from dirty packing, restoring lost power and improving exhaust sound according to the manufacturer.
Materials
Built around premium packing material, this kit is intended for routine RS-12 muffler maintenance. Yoshimura emphasizes that staying on schedule with repacking helps the exhaust continue to perform as designed by promoting freer airflow from the motor and helping prevent the power loss associated with dirty packing.
Installation
The kit includes rivets and a rivet band to support a proper repack job from start to finish. Having the specified hardware on hand helps streamline servicing and supports consistent reassembly when refreshing an RS-12 muffler after hours of use or race intervals.
Included
To round out the service, Yoshimura includes decals for the muffler sleeve and end-cap, along with repacking instructions. The instructions provide guidance for the repack process, while the decals help finish the job with a clean, refreshed look after maintenance.
Performance
Yoshimura explains that off-road systems need repacking after 6-8 hours of use, or after each Race. Over time, dirty packing can restrict airflow from the motor, which the manufacturer says can cause a loss of power and a degradation of sound. Repacking at the suggested intervals helps return the muffler to freer airflow, restoring lost power and improving the exhaust sound.
Materials
This RS-12 series repack kit is supplied as a complete set of service items: premium packing material, rivets, a rivet band, decals for the muffler sleeve and end-cap, and repacking instructions. It is positioned within Yoshimura’s Replacement Service Parts line to support regular maintenance and keep an RS-12 muffler operating as intended.
Fitment
REPACK-RS12-P37 is listed for Honda CRF250R 2022–2024, Honda CRF250RX 2023–2024, Honda CRF450R 2021–2026, Honda CRF450R-S 2023–2024, and Honda CRF450RX 2020–2026. For guidance during service, an installation PDF is provided on the page, and the fitment table below can be referenced to confirm the supported models and years.
| Part Number | REPACK-RS12-P37 |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-12 |
| Shipping Weight | 1 lb |
| Barcode | 00840025913110 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF250R | 2022–2024 |
| Honda | CRF250RX | 2023–2024 |
| Honda | CRF450R | 2021–2026 |
| Honda | CRF450R-S | 2023–2024 |
| Honda | CRF450RX | 2020–2026 |
Fitment as listed by Yoshimura for part number REPACK-RS12-P37.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
