The FMF Factory Fatty Big Bore Pipe is a nod to the legendary works-style cone pipes that defined two-stroke racing. Designed specifically for 105cc+ race motors, this expansion chamber is tuned to deliver strong low-end grunt, a smooth midrange, and enhanced over-rev—all with FMF’s signature craftsmanship and performance edge.
Key Features
Big Bore Tuned: Made for 105cc and larger race motors—must be used with Big Bore silencer (FMF #025226).
Power Across the Band: Broadens and smooths power delivery from low RPMs to high revs.
Dual-Gauge Steel Construction: 19-gauge lower for durability, 20-gauge upper for reduced weight.
Factory Look & Feel: Built to mirror the classic cone-pipe aesthetic used by pro factory teams.
Track-Tested Performance: Dyno and race proven to deliver power gains across the entire RPM range.
Specifications
Item ID: 025224
Type: Pipes
Version: Big Bore
Weight: 3.0 lbs.
Fitment: Requires FMF Big Bore Silencer (Part #025226)
If you're running a 105cc+ race motor, the Factory Fatty Big Bore is your ticket to factory-level performance.
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I was really hoping for this lever to help my 4 year old on his stacyc and it made a huge difference. Closer to the bars, easier for him to squeeze as he is 4 and all around great lever. Super happy with the purchase.
