First race outing for the all-new Italian-built 250 four-stroke as Beta ramps up its motocross push

Beta has released the first on-track images of its all-new RX 250 4T prototype, giving riders the clearest look yet at the brand’s next step in motocross. The bike’s first competitive hit-out came at round two of the Italian MX Internationals at Mantua, where one of Beta’s official test riders campaigned the machine in proper race conditions.

The Mantua appearance marks a key moment for the project after months of development and testing, with Beta now moving into the phase where lap times, race intensity and rider feedback start shaping the final package.

Clean-sheet 250 four-stroke engine

At the centre of the RX 250 4T is a brand-new 250cc four-stroke engine designed and developed entirely in Italy at Beta’s Rignano sull’Arno headquarters. Beta says the motor is a major technical step forward and underlines its intent to grow its motocross line-up beyond the current offerings.

Notably, the engine adopts a modern DOHC layout, now standard fare for high-performance 250 four-strokes, and runs its timing chain on the right-hand side. That’s a clear departure from the RX 450’s arrangement, which places the chain on the opposite side—highlighting that this 250 platform wasn’t simply scaled down from the bigger bike.

New chassis focus for 250-class handling

The engine isn’t the only new part of the story. Beta has also been working heavily on chassis development, with revised side engine mounting points and a strong emphasis on rethinking the engine-to-frame relationship. The goal is improved dynamic behaviour and clearer rider feel—key traits in the ultra-competitive 250F category.

Beta also points to a compact engine layout, particularly around the crankshaft and transmission, aimed at tighter packaging and better mass centralisation to boost overall rideability.

More tech details, more testing to come

Other technical highlights called out by Beta include:

  • Electric starter positioned on the left-hand side
  • Dedicated cooling circuit
  • Redesigned lubrication system
  • New oil pump and revised oil filter placement

While the prototype is described as being at an advanced stage, Beta says several components are still under evaluation. That’s where racing comes in—providing the highest-pressure test bench for collecting data and confirming what works before specs are locked in. Development is scheduled to continue in the coming months, with production timing and further details on a release to be announced down the track.