Engineering
USFS Approved Design
This spark arrester kit is USFS approved and engineered specifically for the Yoshimura RS-12 muffler.
Yoshimura · RS-12
The Yoshimura Spark Arrester Kit RS-12 Muffler, 1.500" is a replacement service part created specifically for the Yoshimura RS-12 series muffler. It is a USFS approved spark arrester designed to add spark arresting capability to select dirt bike applications listed in the fitment table.
Built around Yoshimura’s PTF (Precision Taper Fit), this kit is intended to make installation and removal straightforward while maintaining a purpose-built fit for the RS-12 muffler. It is designed and made in Chino California USA, and includes the spark arrester insert, an end-cap collar, and a set screw.
Engineering
This spark arrester kit is USFS approved and engineered specifically for the Yoshimura RS-12 muffler.
Fitment
Yoshimura builds this kit around PTF (Precision Taper Fit) to help simplify service. The taper-fit approach is designed for easier installation and removal, making it a practical choice when adding or maintaining a spark arrester insert on an RS-12 muffler.
Sound
The kit is supplied as a ready-to-install package with the key components needed for the RS-12 muffler setup: 1 x Spark Arrester Insert, 1 x End-cap collar, and 1 x Set screw. It is positioned within Yoshimura’s Replacement Service Parts lineup for straightforward replacement and upkeep.
Fitment
Designed specifically for the RS-12 series muffler, this Yoshimura spark arrester kit focuses on proper integration with the muffler it was made for. Rather than a one-size approach, it targets select dirt bike applications and is intended to be used where an RS-12 muffler is fitted. Confirm the exact application using the fitment table on the page.
Installation
Serviceability is central to this kit’s design. Yoshimura’s PTF (Precision Taper Fit) is intended to make the spark arrester easier to install and remove, which can help when it’s time for inspection or replacement. An installation PDF is provided on the product page for additional guidance during setup.
Development
Yoshimura reports this spark arrester kit is proudly designed and made in Chino California USA. As part of the Replacement Service Parts product line for the RS-12 series, it is aimed at riders who want a manufacturer-developed component matched to the RS-12 muffler’s intended configuration.
| Part Number | SA-21-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | RS-12 |
| Shipping Weight | 1 lb |
| Barcode | 00840025911895 |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF250R | 2022–2027 |
| Honda | CRF250RX | 2023–2026 |
| Honda | CRF450R | 2021–2027 |
| Honda | CRF450R-S | 2023–2024 |
| Honda | CRF450RX | 2021–2027 |
| Husqvarna | FC250 | 2023–2027 |
| Husqvarna | FC250-Factory-Edition | 2022 |
| Husqvarna | FC350 | 2023–2027 |
| Husqvarna | FC450 | 2023–2027 |
| Husqvarna | FX350 | 2023–2025 |
| Kawasaki | KX250F | 2021–2026 |
| Kawasaki | KX250X | 2021–2026 |
| Kawasaki | KX450X | 2024 |
| KTM | 250SX-F | 2023–2027 |
| KTM | 250SX-F-FACTORY-EDITION | 2022 |
| KTM | 250XC-F | 2023–2026 |
| KTM | 350SX-F | 2023–2027 |
| KTM | 350XC-F | 2023–2026 |
| KTM | 450SX-F | 2023–2027 |
| KTM | 450SX-F-FACTORY-EDITION | 2022 |
| Triumph | TF250 | 2024–2026 |
| Triumph | TF450 | 2025–2026 |
| Triumph | TF450-C | 2025–2026 |
| Triumph | TF450-E | 2025–2026 |
| Triumph | TF450-X | 2025–2026 |
| Yamaha | YZ450F | 2026–2027 |
Fitment as listed by Yoshimura for part number SA-21-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
