The FMF Factory Fatty broadens and smooths the power curve on 2020 and newer Beta 250 and 300 RR models, delivering stronger low-end response, improved midrange pull, and extended over-rev.
Designed to enhance overall rideability, the Fatty provides more tractable power and improved throttle control across the entire powerband, whether you’re riding tight technical terrain or opening it up.
Features
• Broader, smoother power delivery
• Increased low-end and midrange performance
• Extended over-rev
• Carbon steel construction with nickel-plated finish for durability
• FMF Tru-Flo stamping process for precise fit and performance
• Compatible with FMF or stock silencer
• O-rings included