Increase performance throughout the power range with the FMF Factory Fatty Pipe, manufacturer part number 024077 and vendor part number 78-024077. Designed for Yamaha two-stroke motocross and off-road applications, this expansion chamber helps deliver a broad, usable power increase while maintaining the responsive character expected from the YZ125 platform. The Factory Fatty configuration is suited to riders seeking balanced performance across low, mid, and high RPM operation.
The FMF Factory Fatty Pipe features an electro-nickel-plated finish designed to resist chipping and discoloration during normal use. Unlike the plated aftermarket pipe, the factory pipe option uses hand-pounded welds and no coating; this model provides the durable plated finish associated with FMF performance exhaust components. Its construction is intended for demanding riding conditions, including motocross tracks, trails, berms, and varied terrain.
Fitment includes the 2022–2026 Yamaha YZ125, including the 2022 and 2023 YZ125 Monster Energy RE editions, as well as the 2023–2026 Yamaha YZ125X. Confirm the model year and exhaust configuration before installation. This FMF Factory Fatty Pipe is a direct-fit performance component for compatible Yamaha YZ125 models and is manufactured by FMF, with manufacturer part number 024077 and vendor part number 78-024077.
Features:
- Performance: Delivers an all-around power increase throughout the RPM range.
- Finish: Electro-nickel plated for a non-chip finish designed to resist discoloration.
- Construction: Built for demanding motocross and off-road riding conditions.
- Power delivery: Factory Fatty design provides balanced performance across low, mid, and high RPM.
- Fitment: Fits 2022–2026 Yamaha YZ125 models and 2023–2026 Yamaha YZ125X models, including applicable Monster Energy RE editions.
- Brand and part number: FMF manufacturer part number 024077; vendor part number 78-024077.
Fitment:
2022 Yamaha YZ125
2022 Yamaha YZ125 Monster Energy RE
2023 Yamaha YZ125
2023 Yamaha YZ125 Monster Energy RE
2023 Yamaha YZ125X
2024 Yamaha YZ125
2024 Yamaha YZ125X
2025 Yamaha YZ125
2025 Yamaha YZ125X
2026 Yamaha YZ125
2026 Yamaha YZ125X