FMF Factory Fatty Expansion Chamber Pipe — Yamaha YZ85 / YZ85LW 2019–2026

This expansion chamber sharpens throttle response and widens the powerband over the stock pipe.

Fits: Yamaha YZ85 / YZ85LW 2019–2026.

Why riders pick it:

• Precision-tuned expansion chamber reshapes the power curve for a broader spread of usable power
• Works with your stock silencer or a matching FMF silencer
• Direct bolt-on installation, no tuning required

⚠️ For closed-course competition / off-road use only — not legal for street use in some states. Confirm your local regulations.

Not sure it fits your bike? Send us your year and model and we'll confirm.