High-performance two-stroke expansion chamber engineered to broaden the powerband across the entire RPM range, increasing low-end torque, mid-range punch, and top-end over-rev. Constructed using durable stamped steel with smooth hand-welded seams and a nickel-plated finish to deliver clean throttle response and maximum exhaust flow.
Specs & Details
- Manufacturer Part Number: 78-1359
- Alternative Part Number: FMF 024054 / 1820-0173
- Component Type: 2-Stroke Expansion Chamber / Exhaust Pipe
- Material & Construction: Stamped carbon steel with a nickel-plated finish
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ 250 | Two-Stroke Motocross / Off-Road | 1999–2020 |
| Yamaha | YZ 250X | Two-Stroke Cross-Country | 2016–2020 |
TSO Garage Note
The quintessential nickel-plated standard for modern aluminum-frame YZ250s. This chamber smooths out erratic power spikes and widens the usable pull from off-idle all the way through over-rev, giving your engine a crisp, predictable throttle response that shines on both the track and the trail.
