RX 350 (2T MY26)

Introducing the MY26 Beta RX 350 2T

The MY26 RX range is led by the new RX 350 2T, replacing the MY25 RX 300 2T. The MY26 RX 350 2T is a never before seen configuration in motocross and is a true innovation in the 2-stroke category. Developed to combine the agility and simplicity of a 2-stroke with the full-bodied, linear power delivery of a 4-stroke, the RX 350 is ideal for riders seeking high performance paired with ease of use. Featuring a dual-spark head for smoother combustion, a purpose-built power valve system, and optimised crankshaft and piston configurations, the RX 350 delivers robust power at any speed while remaining manageable and fun to ride.

Head: The first noticeable difference when looking at the new engines is the dual-spark-plug head on the RX 350 2T, while the 250cc relies on a classic single spark plug configuration. This differentiates the two motorcycles’ character even further, with the 250cc providing riders with a high-revving engine that competes with the likes of 250 4T bikes, while the 350cc delivers greater torque and a rounded delivery,enhancing its ease of recreational use, at lower speeds while still providing plenty of overall horsepower for race use.

Cylinder, piston and power valve: to further differentiate the two bikes (apart from the obvious engine capacity), Betamotor engineers developed new cylinders and pistons, designed specifically for each engine. The power valve was calibrated differently between the models by adopting different springs.

Crankshaft: the two motorcycles have a different stroke, with the 250cc reaching 72mm and the 350ccreaching 73.6mm.

Crankcase: new engine crankcases, with different internals between the two capacities have beenmatched with each models’ crankshaft.

New components shared by both 2T & 4T models:

Graphics: a modern race look, simple yet bold, the final touch to the Italian RX range.

Radiators: structurally strengthened to prevent deformation, even during heavy use.

Shared Features Across the RX Range
All 2026 RX models share the following upgraded features, ensuring consistency in quality and performance:

The frame now features a cast-in brace to further strengthen the frame around the steering neck area, increasing stiffness.

Aluminium subframe offering light, yet stiff structure with the rigidity to overcome the demands of motocross.

Access to the air filter remains unchanged and is tool free.

Kayaba 48mm forks and 50mm shock, calibrated specifically for MX applications.

Nissin brakes with Galfer discs (260mm front / 240mm rear) for powerful, modular braking.

Xtrig Flexfit handlebar mounts for enhanced comfort and vibration dampening.

Electric start with lithium battery, lighter and a must for quick starts.

Non o-ring chain, lighter and smoother.

Two engine maps (wet/dry) on all models