250 RXF Features:

Engine:

• 249.3cc
• Twin cam with electric start
• Dual fuel injection
• Aluminum center cases w/ magnesium ignition, clutch, and valve covers
• Forged crankshaft
• Box-in-Box piston design
• Durable 5-speed transmission
• Made in Italy, in-house 

The result of this new engine design is a powerplant that delivers high performance while providing a balanced feel that instills confidence in any rider. The engine is extremely light, built with top-tier components not found on other brands. The crankshaft has a bulletproof design, along with a forged connecting rod, while the box-in-box piston allows for a shorter piston pin, which enables more over-rev. 

In terms of performance, the new engine ranks among the best in its class, thanks in part to sophisticated features such as a dual-injection system with injectors positioned on the throttle body and inside the airbox. This configuration allows optimal management of the air-fuel mixture across the entire RPM range, improving response at low revs while ensuring strong, usable power delivery at high revs. The exhaust system developed by Beta engineers and HGS features a system that enhances performance while remaining lightweight and durable.

The diaphragm clutch and gearbox are as strong as those in the 450 RXF model, featuring 7 friction disks and 6 steel disks, with a hydraulic clutch custom-tailored to the 250. The 5-speed transmission, completely redesigned for this engine, features optimized geometry to reduce weight and size without compromising strength, resulting in a lightweight, compact, reliable, and quick-engagement unit. 

Great attention has also been paid to the cooling system, which has been designed using CFD analysis (A computer simulation process used to predict how liquids and gases flow and transfer heat around or through objects) to optimize heat exchange and minimize pressure drops. Unlike the 450 RXFs, this system adopts a closed-type impeller to improve coolant flow while maintaining minimal dimensions and high flow efficiency, and reducing the number of external coolant hoses.

The engine package is finished off with a 5-level launch control, a quick-shift system, two mapping stages, and traction control, all housed in the handlebar pad and easily set by the rider.

Chassis:

• Chro-Moly frame with side-mount engine hangers
• KYB Suspension
• Push-button seat removal
• Quick-access air filter
• Dunlop MX 34 tires
• Nissin brakes
• Excel wheels
• Polyurethane handlebar clamps
• Low seat height at 37.2”

The 250 RXF benefits from a frame designed to meet the specific needs of a 250F size and feel. Compared to the central engine connection solution used on its big brother model, the design features side-mounted engine head mounts: an engineering choice that increases torsional stiffness while maintaining greater vertical flexibility. The result is a new balance between cornering precision and suspension performance, with significant benefits in traction and stability.

Completing the entire package is the tried-and-true suspension system, KYB front fork and rear shock, valved with specific settings developed to suit the lighter weight of the rider and bike. KYB suspension is the industry leader in Supercross and Motocross and was the only choice for the new 250 RXF.

450 RXF:

Beyond Bold New Graphics, the development of the 450 RXF model focuses primarily on electronics and engine power delivery for the 2027 model year. Traction Control has been further refined to be more precise and easier to use. The two maps have been updated to make the most of the engine, and all controls are managed via a new integrated control panel. Rider can choose Dry or Wet and loamy track conditions with a push of a button. Like the new 250, the 450 RXF has added launch control and quick shift. When combined with the overall 450 engine package, this system will enable riders to perform at a higher level.

Also new is the tapered 42mm throttle body. This new component comes straight from the AMA Supercross team and the MXGP team in Europe. It increases air speed and volume to the motor, enhancing low- to mid-range power overall and delivering a quicker throttle response across the board.