How Much Power Does the 2026 Beta 350 RX Make?

Beta came out with the 300 RX in 2021, and its 300cc two-stroke motocross bike was produced through 2025 before the Italian manufacturer unveiled an even larger-displacement premix-burner for motocross riding and racing in the form of the 350 RX. If that wasn’t exciting enough, Beta added yet another two-stroke to its motocross bike lineup for 2026 with the 250 RX.

Powering the 350 RX is a liquid-cooled two-stroke 352cc single-cylinder engine fed by a Keihin PWK 38mm carburetor. It fires to life via electric start and is equipped with a five-speed transmission. Other notable features include a dual spark plug cylinder head, Beta Progressive Valve (BPV) adjustable power valve system, and Moto Tassinari VForce4 reed valve assembly.

We ran the 350 RX on our in-house Dynojet 250i rear-wheel dynamometer and documented peak figures of 46.2 hp and 32.4 lb.-ft. of torque, which is an increase of 5.9 hp and 3.5 lb.-ft. of torque over the 300 RX.