Yoshimura · RS-12
The Yoshimura RS-12 Premium Muffler Repack Kit 700G is a replacement service parts kit designed to refresh RS-12 off-road exhaust packing at the recommended service intervals. Yoshimura notes that off-road systems should be repacked after 6–8 hours of use, or after each race, to help the exhaust continue to perform as intended.
This kit is listed for Honda CRF250R 2025–2027 and Honda CRF250RX 2025 (see the fitment table below). By replacing dirty packing that can restrict airflow, repacking helps restore freer exhaust flow and supports cleaner sound characteristics.
Materials
This kit includes Yoshimura premium packing material intended for RS-12 mufflers. Yoshimura explains that worn or dirty packing can restrict airflow and contribute to power loss and sound degradation, making routine repacking an important part of off-road exhaust service.
Included
To support a proper reassembly after servicing the muffler, the kit includes rivets and a rivet band. These components are provided to help complete the repack process with the needed fastening items in one package.
Installation
Along with the repack components, the kit includes decals for the muffler sleeve and end-cap, plus repacking instructions. The included instructions and the installation PDF shown on the page help guide the service process from disassembly through final reassembly.
Performance
Yoshimura emphasizes that consistent muffler maintenance is essential for an off-road exhaust to operate the way it was designed. They recommend repacking after 6–8 hours of use, or after each race. As packing becomes dirty, airflow from the motor can be restricted, which Yoshimura says leads to a loss of power and degradation of sound. Repacking replaces that material to allow freer airflow and help restore lost power while improving exhaust sound.
Included
The RS-12 Premium Muffler Repack Kit 700G is assembled as a complete service solution for the repack procedure. It includes premium packing material, rivets, and a rivet band to support reinstallation. Decals for the muffler sleeve and end-cap are also included, along with repacking instructions to help keep the process organized and consistent during routine maintenance.
Fitment
This repack kit is specified for Honda CRF250R 2025–2027 and Honda CRF250RX 2025 applications (confirm details in the fitment table below). For additional guidance during the service process, the product page provides an installation PDF link, offering a ready reference while performing the repack procedure.
| Part Number | REPACK-RS12-P39 |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-12 |
| Shipping Weight | 1 lb |
| Barcode | 00840025916845 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF250R | 2025–2027 |
| Honda | CRF250RX | 2025 |
Fitment as listed by Yoshimura for part number REPACK-RS12-P39.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
