Upgrade your motorcycle’s exhaust performance with the FMF Q4 Hex Spark Arrestor Slip-On Muffler, manufacturer part number 044452 and vendor part number 79-4202. Designed for select Yamaha four-stroke models, this muffler uses internal baffles, chambers, and advanced sound-absorbing materials to help accelerate exhaust flow while maintaining a controlled sound level and minimizing power loss.
The FMF Q4 Hex muffler is well below the 96-decibel sound output on most compatible machines, making it a practical choice for riders who need to meet strict sound requirements. Its U.S. Forestry-approved spark arrestor features a maintenance-free stainless steel screen to help prevent hot exhaust particles from leaving the muffler during off-road use. The slip-on design provides a straightforward replacement or performance upgrade for the original muffler.
Fitment includes 2019–2024 Yamaha YZ250F models, with compatibility varying by model year, and 2020–2023 Yamaha YZ250FX models. Verify the motorcycle model and year before ordering to ensure proper installation. This FMF exhaust component is built for riders seeking dependable off-road performance, reduced exhaust noise, and approved spark-arresting protection in a durable muffler package.
Features:
- Performance-oriented slip-on muffler designed to improve exhaust flow with minimal power loss
- Internal baffles, chambers, and sound-absorbing materials help control exhaust noise
- Sound output is well below 96 decibels on most compatible machines
- U.S. Forestry-approved spark arrestor supports compliant off-road riding
- Maintenance-free stainless steel spark arrestor screen
- 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