High-performance heavy-duty two-stroke expansion chamber engineered to deliver robust, tractor-like bottom-end and midrange power for late-80s and early-90s liquid-cooled Honda CR250R motocross and off-road 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: 78-1109
- Alternative Part Number: FMF 025004 / 1820-0081
- 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 |
| Honda | CR 250R | Two-Stroke Motocross / Off-Road | 1988–1991 |
TSO Garage Note
The ultimate armor upgrade for vintage late-80s and early-90s Honda CR250R builds hitting the trails or vintage MX track. This heavy 18-gauge chamber thickens up the bottom-end pull so you can lug through tight sections with total control, while easily absorbing the brutal rock and log impacts that would instantly crush a thin stock expansion chamber.
