FMF Power Bomb Header Pipe 040073 for Yamaha YZ250F and WR250F

The FMF Power Bomb is a four stroke header pipe unit that has a unique bulge precisely located in the header system. A "pre muffler" of sorts, the Power Bomb actually lowers sound output because it creates more surface area to absorb the sound medium (exhaust). The surface area of the perforated core lets the sound exit into the absorbing material (steel wool packing) and then allows the air to expand, cool and ramp back up with the higher pressure air. The result? The FMF Power Bomb is instrumental in reducing the decibel level on any four stroke and because of the expansion and contraction on exhaust through the system, the flow has been increased by nearly 10%. That means more power throughout the range.

The FMF Power Bomb header pipe is a high-performance four-stroke exhaust component designed for select Yamaha YZ250F and WR250F motorcycles. Part number 040073 features FMF’s distinctive Power Bomb expansion chamber, which acts as a pre-muffler to help reduce exhaust sound while improving overall exhaust flow. Its precisely positioned bulge increases surface area within the header system, allowing exhaust gases to expand, cool, and transition efficiently through the system.

Engineered for strong bottom-to-mid-range performance, the FMF Power Bomb helps deliver improved power throughout the usable rpm range. The perforated core allows exhaust sound to pass into the surrounding packing material, helping lower decibel output without sacrificing performance. The result is a practical upgrade for riders seeking enhanced response and performance from a four-stroke Yamaha engine.

The FMF Power Bomb header is designed for full-service access to the oil filter, helping simplify routine maintenance and service work. This header fits 2001–2006 Yamaha YZ250F models and 2002–2005 Yamaha WR250F models. Verify motorcycle year, model, and exhaust system compatibility before installation. Manufacturer and vendor part number: FMF 040073.

Features:

• Performance: Tuned to improve bottom-to-mid-range engine performance.
• Exhaust flow: Power Bomb expansion chamber design helps increase exhaust flow and support stronger power across the rpm range.
• Sound reduction: Increased internal surface area helps absorb exhaust sound and reduce overall decibel output.
• Service access: Designed to maintain full access to the oil filter for convenient routine maintenance.
• Fitment: Fits 2001–2006 Yamaha YZ250F and 2002–2005 Yamaha WR250F four-stroke motorcycles.
• Brand and part number: FMF Power Bomb header pipe, manufacturer and vendor part number 040073.

Fitment:
2001 Yamaha WR250F
2001 Yamaha YZ250F
2002 Yamaha WR250F
2002 Yamaha YZ250F
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F
2005 Yamaha WR250F
2005 Yamaha YZ250F
2006 Yamaha WR250F
2006 Yamaha YZ250F
2007 Yamaha WR250F
2008 Yamaha WR250F
2009 Yamaha WR250F
2010 Yamaha WR250F
2011 Yamaha WR250F
2012 Yamaha WR250F
2013 Yamaha WR250F