The FMF Factory Fatty expansion chamber pipe is designed to deliver an all-around power increase throughout the engine’s operating range. Part number 025076 is engineered for select KTM two-stroke motocross models and provides a performance-focused replacement for the original exhaust pipe. Its tuned design helps broaden usable power for improved acceleration and stronger response across the powerband.
The pipe is electro-nickel plated for a durable, non-chip finish that resists discoloration during normal use. Unlike the plated pipe construction, the Factory pipe features hand-pounded welds and no coating, replicating the appearance and construction style of FMF works bikes. This combination of performance-oriented design and model-specific fitment makes the FMF Factory Fatty a practical choice for riders seeking enhanced two-stroke exhaust performance.
This FMF product fits the 2004–2010 KTM 125 SX, 2007–2008 KTM 144 SX, and 2009 KTM 150 SX, subject to the specific model year listed. Verify the motorcycle model and year before installation to ensure proper fitment. Manufacturer and vendor part number: FMF 025076.
Features:
- Power Increase: Designed to provide an all-around increase in power throughout the engine’s operating range.
- Electro-Nickel Plating: Provides a durable, non-chip finish that helps resist discoloration.
- Factory Construction: Features hand-pounded welds and no coating, similar to FMF works bike pipes.
- Two-Stroke Performance: Tuned expansion chamber design supports responsive power delivery on compatible KTM motocross models.
- Fitment: Fits 2004–2010 KTM 125 SX, 2007–2008 KTM 144 SX, and 2009 KTM 150 SX models.
- Brand and Part Number: FMF Factory Fatty, manufacturer and vendor part number 025076.
Fitment:
2004 KTM 125 SX
2004 KTM 150 SX
2005 KTM 125 SX
2005 KTM 150 SX
2006 KTM 125 SX
2006 KTM 150 SX
2007 KTM 125 SX
2007 KTM 144 Sx
2007 KTM 150 SX
2008 KTM 125 SX
2008 KTM 144 Sx
2008 KTM 150 SX
2009 KTM 125 SX
2009 KTM 150 SX
2009 KTM 150 XC
2010 KTM 125 SX
2010 KTM 150 SX
2010 KTM 150 XC