
FMF
Factory Fatty Pipe
Part # 1820-1851
$299.99
In Stock
- 60-day returns
- Free shipping over $100
- Secure checkout
CA Prop 65 Warning: WARNING:
Confirmed fit for 8 motorcycle configurations across Yamaha, model years 2019–2026.
| Years | Make & Model |
|---|---|
| 2019-2026 Yamaha | YZ85 |
- The Factory Fatty is reminiscent of the “works” or cone pipe once used by Factory Teams and it shares many of the same characteristics with its craftsmanship and material quality
- Broadens and smooths out the power curve while boosting gains throughout the entire power band, more low-end, more mid, and increased over-rev
- No matter what type of riding you do, the Fatty has the benefits you’re looking for
- Lighter 20 gauge steel used for the body of the pipe
- 19 Gauge steel used for the header portion
- Hand pounded seams for smooth flow transitions
Customer Reviews
No reviews yet — be the first to review this part.
Overview
The FMF 1820-1851: Factory Fatty Pipe. Confirmed fit for 8 motorcycle configurations across Yamaha, model years 2019–2026. Ships from Greasemoto — a veteran-owned motorcycle parts shop in Fort Worth, TX — with free U.S. shipping on orders over $100.
More from FMF

FMF
1861-0585
Wash Plug - 2-Stroke
$5.99

FMF
1860-0828
Pillow Muffler Packing - 4-Stroke
$31.99

FMF
1821-2029
Q4 Muffler
$499.99

FMF
FMF12-002
Muffler Packing - 2-Stroke
$10.99

FMF
1820-0739
Powercore 4 Exhaust
$279.99

FMF
1820-1869
Gnarly Pipe
$329.99

FMF
FMF12-004
Muffler Packing - 4-Stroke
$14.99

FMF
25014695
Chamber Hat - Black
$32.00
