Beta has announced its 2026 motocross line and it includes a new 350cc two-stroke! The new model replaces the previous 300cc two-stoke and is accompanied by a new 250 two-stroke. Those two models join an updated 450RX. The full press release follows:
Beta has added two new motocross models to join the big brother 450 in the RX range. All-new 250 and 350 RX 2 strokes are the new bosses in town! Beta’s 450 RX has been racing on the world MXGP tour for four years and the AMA USA Supercross series for two and has proven to be a serious contender. The Italian Beta engineers decided to “Go Big” for 2026 and add not only a 250 cc bike to race in the proper classes but also added a 350 RX smoker as well for everyone else! All Beta MX models are designed with the trademark RideAbility in mind. A motorcycle that is overall easier to ride.
250 RX: Another all-new model for 2026 is the smaller brother to the 350, the long-awaited 250 RX! Like the 350 version, this 2-stroke powered motocross model will appeal to all of those wanting a high-revving, lightweight 250 that can tear up berms with a distinctive sound that can only be heard from a Beta. The 250 RX also receives new engine cases along with the new cylinder, cylinder head, and exhaust. The 250 uses a single-spark head. Finally, a Beta Moto model that can run in many 250 classes.
350 RX: All new for 2026, this new model replaces the 300 version for the 2026 season. New engine cases, bore and stroke, as well as a twin-plug head to ignite the special power only a big-bore 2-stroke can provide. The longer crankshaft, combined with the final gearing ratio of 13/47, provides a large amount of torque and overall horsepower that will turn some heads. This new 350 motocrosser will thrive in many different track conditions. Clearly in a class of its own!
450 RX: Proven through races all over the world, including the USA Supercross series and MXGP. The 450 RX provides a ride like no other, quick turning yet stable; powerful yet easy to ride, are just a few things the press is saying about the 4-stroke model. An engine with enough power for a top-level pro rider while providing the right amount of power to the amateur as well. For 2026, the 450 RX receives a new cylinder head with improved flow that provides even more power. This, along with a matched intake manifold and a new exhaust, means the 450 will still bark with power but do it in a quieter way. A redesigned counterbalance shaft to reduce vibration and new mapping to go with the new cylinder head and exhaust.
The Updated 2026 450 RX
Additional Features of Each Model:
450 RX 4-Stroke
Engine: The 450cc engine development was focused on providing riders a significant performance increase compared to the previous model, offering a stronger torque curve that can be used under all conditions. This achievement was possible due to a new cylinder head with a performance-enhancing piston, a new intake manifold, and a different exhaust system. The head’s overhaul – developed through CFD analysis and many flow bench calibrations – includes an improved intake duct to enhance air circulation inside the engine. The new manifold, following the flow line, has a longer internal horn to improve the tuning of pressure waves, and thus increase their fill while intaking air. The piston includes new