High-performance heavy-duty two-stroke expansion chamber engineered to deliver robust, tractor-like bottom-end and midrange power for Beta off-road and enduro applications. Constructed from tough 18-gauge carbon steel to withstand severe rock strikes, heavy trail abuse, and extreme thermal cycling while significantly improving low-end torque and throttle response.
Specs & Details
- Manufacturer Part Number: 78-1147
- Alternative Part Number: FMF 025156 / 1820-1498
- Component Type: 2-Stroke Expansion Chamber / Exhaust Pipe
- Material & Construction: Heavy-gauge 18-gauge carbon steel with a nickel-plated finish
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Beta | 250 / 300 RR | Two-Stroke Off-Road / Enduro | 2013–2019 |
TSO Garage Note
The ultimate armor upgrade for adding meaty bottom-end grunt to Italian-built Beta 250 and 300 two-strokes. This heavy 18-gauge chamber builds instant low-end traction so you can lug through tight, technical singletrack without stalling, while easily shrugging off the brutal boulder and log hits that would crumple a stock pipe.
