00-04 Yamaha YZ125
Fatty Fat "Thick" Chamber.
Utilizing computer to the mathematical equations in chamber design, which is essential for a two-cycle engine, FMF FATTY is one of the highest indicators of other chamber manufacturers worldwide.
FMF exclusive TRU-FLO stamp provides good fitting and performance, and the wide all-around power characteristics from slow to high speeds have earned high reputation and popularity from professional riders to Sunday riders.
FATTY is the first chamber recommended by FMF for riders seeking faster speed while still being satisfied with the normal chamber characteristics.