More details (and video) emerge on Beta’s all-new RX 250 4T four-stroke prototype including a compact, higher-revving DOHC engine in a fresh frame designed to improve rider feel and control – there has got to be an enduro bike coming soon...

Marking a milestone in the Beta’s off-road development programme, the Beta 250 RX four-stroke made its competitive debut at the second round of the Italian MX Internationals in Mantua, where it was raced by one of Beta’s official test riders.

It’s a milestone because this is the first time the Italian manufacturer has revealed a 250 4T all of its own, designed, developed and manufactured in-house. It got us excited because it would naturally lead us to expect/want an enduro 250 F version could also be in the pipeline.

New Engine Platform Developed in Italy

The RX 250 4T is an all-new 250cc four-stroke engine, designed and developed from the ground up at Beta’s headquarters in Rignano sull’Arno, Italy.

The new engine features a timing chain positioned on the right-hand side, with the adoption of a modern DOHC architecture — now the benchmark for high-performance small-capacity four-stroke engines. This configuration differs from the current RX 450 engine, which utilises a chain positioned on the opposite side, showing the “clean-sheet approach” taken with the 250 platform.

Compact Design

A standout feature highlighted by Beta of the new engine is its compact layout, particularly between the crankshaft and transmission assemblies. They boast tight packaging which plays a critical role for mass centralisation and overall rideability.

All-New Chassis Development

The RX 250 4T prototype features revised side engine mounting points, with the engineering direction focusing on redefining the engine/frame relationship to achieve improved behaviour and rider feedback.

The result is a completely new technical platform built specifically around the demands of the 250cc motocross category but, we bet our hats, will also transfer to being a very handy bike between the tapes at an enduro.

Additional technical highlights include:

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

Check the video edit from the Italian MX race

 

Still in testing programme

While the prototype is at an advanced stage, Beta say several components remain under evaluation. Race conditions provide the ultimate test bench, allowing engineers to gather further data and rider feedback before finalising specifications.

They will continue refining the RX 250 4T in the coming months as development progresses toward final production bike.

 

Timing on the release of a production version of the RX 250 4T will be announced in coming months.