The FMF Q4 Spark Arrestor Exhaust Muffler, manufacturer part number 044195 and vendor part number 79-4186, is designed for select Yamaha four-stroke off-road motorcycles. This performance muffler fits the 2003–2005 Yamaha YZ250F and the 2003–2006 Yamaha WR250F, providing efficient exhaust flow with controlled sound output for trail and closed-course riding applications.
Featuring internal baffles, chambers, and advanced sound-absorbing materials, the FMF Q4 helps accelerate exhaust flow while reducing noise and minimizing power loss. Its sound output remains well below 96 decibels on most compatible machines, helping riders meet strict riding-area sound requirements without sacrificing dependable performance. The compact muffler design supports practical installation and durable use in demanding off-road environments.
For added trail compliance, this FMF exhaust muffler includes a U.S. Forestry-approved spark arrestor with a maintenance-free stainless steel screen. The spark arrestor helps prevent hot exhaust particles from exiting the muffler, making the system suitable for riding areas that require approved spark-arresting equipment. Verify your motorcycle model and existing exhaust configuration before installation to ensure proper fitment.
Features:
- Internal baffles, chambers, and sound-absorbing materials help accelerate exhaust flow with less noise and minimal power loss
- Sound output remains well below 96 decibels on most compatible Yamaha motorcycles to help meet strict sound requirements
- U.S. Forestry-approved spark arrestor supports compliant off-road use
- Maintenance-free stainless steel spark arrestor screen provides durable, low-maintenance performance
- Fitment: 2003–2005 Yamaha YZ250F
- Fitment: 2003–2006 Yamaha WR250F
- Brand: FMF
- Model: Q4 Spark Arrestor Exhaust Muffler
- Manufacturer part number: 044195
- Vendor part number: 79-4186
Fitment:
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F
2005 Yamaha WR250F
2005 Yamaha YZ250F
2006 Yamaha WR250F