FMF Factory Fatty Pipe 024052 — Yamaha YZ125 YZ125X 2005-2021

Product Description

The FMF Factory Fatty Pipe is inspired by the iconic "works" cone pipes once reserved exclusively for factory race teams. This pipe brings professional-grade craftsmanship and material quality to your personal machine, significantly broadening and smoothing out your power curve. By boosting gains throughout the entire power band—providing more low-end, improved mid-range, and increased over-rev—the Fatty is the ultimate performance choice for any riding style.

Constructed for performance and longevity, this pipe utilizes 20-gauge steel for the main body to keep weight down, while the header portion is built from 19-gauge steel to withstand intense heat and vibration. The hand-pounded seams ensure smooth, unrestricted flow transitions, eliminating exhaust turbulence to help your engine perform at its absolute peak.

Top Features: FMF Factory Fatty Pipe

• Race-inspired design reminiscent of factory "works" cone pipes
• Broader, smoother powerband with gains in low, mid, and top-end
• Lightweight 20-gauge steel body with durable 19-gauge steel header
• Hand-pounded seams for optimized exhaust gas flow

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Does this pipe increase top-end speed?
A: Yes, the Factory Fatty is specifically designed to boost gains across the entire powerband, including a noticeable increase in over-rev compared to stock pipes.

Q: Is this pipe difficult to install?
A: It is a direct bolt-on replacement for your stock pipe. However, we always recommend replacing your exhaust O-rings and checking your jetting to match the new performance characteristics of your bike.

Expert Pro-Tip: When fitting a performance pipe, don't ignore your jetting. A new pipe changes your engine's scavenging efficiency; if you don't adjust your main jet and needle clip position, you risk running lean, which can cause premature piston wear or even engine failure on a 125cc two-stroke.

Recommended Pairings:
o Yamaha 2-Stroke Performance Parts & Upgrades
o Yamaha YZ125 Performance Parts & Upgrades
o Premium Motorcycle Chemicals & Maintenance

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.

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