FMF Fatty Pipe Expansion Chamber — Yamaha PW80 1991–2006

Bolt-on expansion chamber engineering that sharpens throttle response and widens the power spread across the rev range.

Fits: Yamaha PW80 1991–2006.

Why riders pick it:

• Low-end and midrange focused chamber tuning for broad, tractable power delivery
• Ideal for tight trails and technical terrain where snappy top-end power isn't the priority
• Works with your stock silencer or any FMF 2-stroke 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.