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FMF Factory 4.1 — Full System — Yamaha WR250F (2007-2013), Yamaha WR450F (2007-2011) + 2

Part # 044235
Item #357753
Fits 4 motorcycles
  • Yamaha
    • WR250F · 2007–2013
    • WR450F · 2007–2011
    • YZ250F · 2006–2009
    • YZ450F · 2006–2009
$499.99 $449.99 Save $50.00
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FMF Factory 4.1 Full System — Yamaha WR250F (2007-2013), Yamaha WR450F (2007-2011) + 2 more, 4-Stroke
Product Details

The Factory 4.1 is FMF's race-bred 4-stroke full system — the foundation of the Factory 4.1 RCT lineup. Lighter than stock with FMF's race-tested tuning across the RPM range.

  • Lighter than stock 4-stroke system
  • FMF race-developed tuning
  • Stainless steel construction
  • Rapid Tuning System (RTS) compatible

Fitment: 4-stroke bike specific — fits the following models:

  • Yamaha WR250F (2007-2013)
  • Yamaha WR450F (2007-2011)
  • Yamaha YZ250F (2006-2009)
  • Yamaha YZ450F (2006-2009)

This is a 4-stroke exhaust. It is engineered for the 4-stroke engine architecture above and physically will not fit a 2-stroke bike. Verify your engine type before purchase.

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