FMF Factory Fatty Pipe 024056 — Yamaha YZ250 1999-2026

Product Description

The FMF Factory Fatty Pipe is the gold standard for two-stroke performance, modeled after the legendary "works" cone pipes used by professional factory teams. Designed to bring that elite level of craftsmanship and material quality to your Yamaha YZ250, this pipe significantly broadens and smooths out your power delivery. Whether you are charging out of corners or hitting high-speed straights, the Fatty provides noticeable gains in low-end torque, mid-range pull, and increased over-rev.

Built to handle the demands of off-road racing, this pipe features a lightweight 20-gauge steel body to keep the bike nimble, paired with a robust 19-gauge steel header for superior durability against rocks and roost. The seams are meticulously hand-pounded after the stamping process, ensuring smooth, unrestricted internal transitions that eliminate turbulence and maximize engine efficiency across the entire RPM range.

Top Features: FMF Factory Fatty Pipe

• Race-proven design modeled after authentic factory "works" cone pipes
• Broadens the powerband for more low-end, mid-range, and over-rev
• Durable 19-gauge steel header paired with a lightweight 20-gauge steel body
• Hand-pounded seams for smooth, 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 require a different silencer?
A: No, the Factory Fatty is designed to be compatible with your stock silencer, though pairing it with an FMF performance silencer will further enhance your overall exhaust system efficiency.

Q: Will I need to re-jet my YZ250 after installation?
A: Because this pipe significantly changes the scavenging characteristics of your engine, you should always check your main jet and needle clip position to ensure optimal air/fuel ratios.

Expert Pro-Tip: The YZ250 is one of the most consistent engines ever built, but it is sensitive to exhaust sealing. When installing this pipe, ensure your exhaust O-rings are in perfect condition and use a small bead of high-temp silicone at the flange. This prevents the "leaky pipe" power loss that robs your YZ250 of its famous snap.

Recommended Pairings:
o Yamaha 2-Stroke Performance Parts & Upgrades
o Yamaha YZ250 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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