Yoshimura · RS-9T
The Yoshimura RS-9T Dual Premium Muffler Repack Kit 450g is a replacement service parts package designed to restore proper muffler function through routine repacking. Yoshimura notes that off-road systems should be repacked after 6-8 hours of use, or after each Race, to help the exhaust perform as intended.
This kit is specified for Honda CRF450R 2017–2020, Honda CRF450R-S 2022, and Honda CRF450RX 2017–2020 applications using dual RS-9T mufflers. Yoshimura explains that dirty packing can restrict airflow and lead to loss of power and degraded sound, while fresh packing supports freer airflow to restore performance and improve exhaust sound.
Built around servicing dual RS-9T mufflers, this kit is described by Yoshimura as containing all components needed for a complete repack. It is intended to simplify the maintenance process by bundling the core wear items typically replaced during repacking into one matched package.
The kit includes Silent Sport Premium Packing Material (450g x 2 QTY). Yoshimura emphasizes that replacing dirty packing at the suggested intervals helps prevent restricted airflow that can contribute to power loss and sound degradation, bringing the exhaust back toward its designed operation.
Along with packing material, the kit includes Stainless Rivet (C3-RIVET x 16 QTY), Rivet Band (RBYM9 x 4 QTY), and RS-9T End-cap Decals (RS9-NB004L x 1 QTY / RS9-NB004R x 1 QTY). These items support a thorough repack and refresh the end-cap labeling.
Performance
Yoshimura states that off-road exhaust systems need regular repacking after 6-8 hours of use, or after each Race. Over time, packing becomes dirty, and Yoshimura explains that this can restrict airflow from the motor, leading to a loss of power and a degradation of sound. Repacking at the suggested interval is positioned as an essential step to help the exhaust perform the way it was designed, supporting freer airflow that can restore lost power and improve the exhaust sound.
Materials
This RS-9T Dual Premium Muffler Repack Kit 450g combines the consumable materials and supporting pieces commonly replaced during service. It includes Silent Sport Premium Packing Material (450g x 2 QTY), Stainless Rivet (C3-RIVET x 16 QTY), Rivet Band (RBYM9 x 4 QTY), and RS-9T End-cap Decals (RS9-NB004L x 1 QTY / RS9-NB004R x 1 QTY). Together, these components are intended to cover the needs of repacking dual RS-9T mufflers.
Fitment
This Yoshimura repack kit is listed for Honda CRF450R 2017–2020, Honda CRF450R-S 2022, and Honda CRF450RX 2017–2020 models equipped with dual RS-9T mufflers. For confirmation, refer to the fitment table on the page. An installation PDF is provided on the product page to guide the repacking process and help ensure the components in the kit are used as intended.
| Part Number | REPACK-RS9T-P10 |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-9T |
| Shipping Weight | 5 lb |
| Barcode | 00840025909199 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2017–2020 |
| Honda | CRF450R-S | 2022 |
| Honda | CRF450RX | 2017–2020 |
Fitment as listed by Yoshimura for part number REPACK-RS9T-P10.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
