FMF - Fatty Pipe (Yamaha)

FMF – Fatty Pipe

The FMF Fatty Pipe is the legend that keeps on winning — the most copied performance two-stroke pipe in the world. Designed through computer modeling and refined with hours of dyno testing, the Fatty is all about delivering smooth, usable power from bottom to top. No matter what you ride or how you ride it, this pipe transforms your bike’s feel — more torque off the start, a cleaner midrange pull, and stronger over-rev when you stay on the gas.

Every Fatty Pipe is built using FMF’s Tru-Flo stamping process for perfect fit and consistent performance. Made from strong 19-gauge U.S. steel and finished with an electro-nickel plating, it resists chips, rust, and discoloration while keeping that clean, factory look. It’s built to last and easy to maintain, which is why it’s FMF’s best-selling pipe for motocross, off-road, and trail riders alike.

Why We Like It:
It smooths everything out while still hitting hard. The Fatty gives your bike a stronger, more predictable powerband that makes it easier to stay in control and keep traction — whether you’re railing berms, climbing hills, or threading through tight singletrack. It just makes the whole bike feel more alive.

Why It’ll Work for You:
This pipe helps your engine make better power across the entire rpm range. You’ll feel stronger low-end torque, smoother pull through the mid, and a clean rev on top — without needing constant tuning or maintenance. The nickel finish keeps it protected and easy to wash, so it looks as good as it performs.

Variants / Options:
Available in three styles to match your riding:

• Fatty: Balanced power across the entire range — the all-around favorite.
  
  

• Gnarly (G): Heavier 18-gauge steel for maximum low-end torque and off-road durability.
  
  

• Factory Rev (FR): Tuned for mid-to-top power, perfect for deep sand and fast tracks.
  
  

Key Features:

• Computer-designed and dyno-tested for each bike model
  
  

• Tru-Flo stamping ensures perfect fit and flow
  
  

• 19-gauge U.S. steel construction for strength and durability
  
  

• Nickel-plated finish resists chips, rust, and discoloration
  
  

• Boosts power throughout the entire powerband
  
  

• Compatible with stock or FMF silencers
  
  

• FMF’s most versatile and best-selling two-stroke pipe