Yoshimura · RS-12 · Full System
The Yoshimura RS-12 Signature Series titanium full exhaust system is built for riders upgrading the 2025–2027 Honda CRF250R and 2025–2026 Honda CRF250RX. Designed around the updated airbox and ECU configuration, it delivers a fit and performance focus tailored to these models.
Yoshimura reports up to +8% HP gain @12,000rpm and up to +8% torque @8650rpm. The system ships with an INS-31-K sound insert already installed, chosen to deliver an exhaust note that stays rider-friendly while supporting the power delivery Yoshimura developed with Team Honda HRC Progressive.
Engineering
The RS-12 introduces a hydroformed muffler profile designed to reduce weight while making better use of available space for a more tailored fit. Yoshimura notes hydroforming helps minimize material usage and removes many limits of conventional metal forming, supporting a stronger, lighter muffler design.
Technology
A deep draw one-piece resonator is integrated into the new sleeve design to help improve durability. By building the resonator into the muffler sleeve, Yoshimura focuses the RS-12 on long-term use in demanding motocross conditions without losing the compact packaging the RS-12 profile targets.
Development
Developed in cooperation with Team Honda HRC Progressive, the header resonator is engineered as a functional component rather than a styling add-on. Yoshimura states it is designed to maximize power across the spectrum while enhancing rider connectivity, aligning the system’s response with modern CRF250R/RX tuning.
Development
With the 2025 Honda CRF250R’s new airbox and ECU configuration, Yoshimura’s engineering and development work centered on extracting performance from the updated platform. The RS-12 Signature Series titanium full system was developed with input from Team Honda HRC Progressive, reflecting a race-informed approach to power delivery for the latest CRF250R and CRF250RX models listed in the fitment table.
Performance
This full system is backed by manufacturer-verified performance claims shown with the dyno information on the page. Yoshimura reports up to +8% HP gain @12,000rpm and up to +8% torque @8650rpm. Those gains are tied to the complete RS-12 titanium system design, including the resonator-focused approach described by Yoshimura for power across the spectrum.
Sound
The RS-12 for the CRF250R/RX comes with an INS-31-K sound insert installed. Yoshimura describes this insert as producing an ear pleasing exhaust note while also making the best power for the new Honda configuration. Spark arrester options are listed on the page, and the system’s included and not-included components are summarized in the specifications and sound insert tables.
Fitment
This Yoshimura full system is intended specifically for Honda CRF250R 2025–2027 and Honda CRF250RX 2025–2026. For a smoother install and confirmation of application details, the page provides fitment information along with an installation PDF. Product photos, a video, and the dyno chart are also available to help riders review the system’s layout and documented performance data before installation.
Figures as reported by Yoshimura.
| Part Number | 228461S720 |
|---|---|
| Brand | Yoshimura |
| Product Line | Signature Series Exhaust System |
| Series | RS-12 |
| System Type | Full System |
| Material | Titanium |
| Sound Insert (Included) | INS-31-K |
| Spark Arrester | Not included |
| Shipping Weight | 15 lb |
| Barcode | 00840025915947 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF250R | 2025–2027 |
| Honda | CRF250RX | 2025–2026 |
Fitment as listed by Yoshimura for part number 228461S720.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-31-K | Sound Insert | Yes |
| SA-21-K | Spark Arrester | No |
| SA-20-K | Spark Arrester | No |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
