Upgrade your Yamaha off-road motorcycle with the FMF Factory 4.1 RCT aluminum slip-on exhaust. Designed with FMF Resonance Chamber Technology, this tuned exhaust helps reduce sound levels while maintaining strong power output. The patented core shape and chamber design refine exhaust pressure for responsive performance across the engine’s operating range.
The FMF Factory 4.1 RCT uses an aluminum canister paired with a stainless steel mid-pipe for a practical balance of performance and durability. Factory Forward Engineering centralizes mass to improve handling characteristics and helps reduce the likelihood of crash damage. The innovative rear end cap allows straightforward installation of tuning tip inserts or a spark arrestor, and a spark arrestor and wash plug are included.
This FMF exhaust is designed to fit 2019–2024 Yamaha YZ250F models and 2020–2023 Yamaha YZ250FX models, providing application-specific core specifications for dependable fitment and tuned performance. Manufacturer part number: 044453. Vendor part number: 79-40638.
Features:
- Resonance Chamber Technology: Uses FMF’s latest chamber technology to help lower sound levels while preserving maximum power output.
- Patented Core Shape: Reduces exhaust noise while supporting strong engine performance.
- Patented Canister Shape: Increases internal volume for additional sound-absorbing material.
- Patented Chamber Design: Enhances and refines exhaust pressure for application-specific performance.
- Factory Forward Engineering: Centralizes mass and helps reduce susceptibility to crash damage.
- Tuned Exhaust: Uses optimized core specifications for each motorcycle application.
- Aluminum Construction: Includes an aluminum canister with a stainless steel mid-pipe.
- Innovative Rear End Cap: Simplifies installation of tuning tip inserts or a spark arrestor.
- Included Accessories: Includes a spark arrestor and wash plug.
- Fitment: Fits 2019–2024 Yamaha YZ250F and 2020–2023 Yamaha YZ250FX models.
Fitment:
2019 Yamaha YZ250F
2020 Yamaha YZ250F
2020 Yamaha YZ250FX
2021 Yamaha YZ250F
2021 Yamaha YZ250FX
2022 Yamaha YZ250F
2022 Yamaha YZ250FX
2023 Yamaha WR250F
2023 Yamaha YZ250F
2023 Yamaha YZ250FX
2024 Yamaha WR250F
2024 Yamaha YZ250F
2024 Yamaha YZ250FX
2025 Yamaha YZ250F
2025 Yamaha YZ250FX
2026 Yamaha YZ250F
2026 Yamaha YZ250FX