Massive torque. Lightweight two-stroke character. Built to dominate the track.
The 2027 Beta RX 350 2-Stroke brings big-bore two-stroke performance to Beta's motocross lineup. Its 351.7cc liquid-cooled single-cylinder engine combines a 78mm bore with a 73.6mm stroke, delivering the strong torque and horsepower that make the 350 RX unique in the motocross world.
Beta designed the RX 350 around a linear and controllable power delivery, giving riders access to its substantial power without sacrificing the rideability expected from a modern Beta. The engine features a Beta Progressive Valve (BPV) power valve, counterbalancer, twin-plug cylinder head, Keihin PWK 38mm carburetor, electric start and a 5-speed transmission.
Engine: 351.7cc liquid-cooled 2-stroke
Bore x Stroke: 78mm x 73.6mm
Compression Ratio: 12.45:1
Power Valve: Beta Progressive Valve (BPV)
Cylinder Head: Twin-plug
Carburetor: Keihin PWK 38mm
Lubrication: Premix
Starting: Electric start
Transmission: 5-speed
Clutch: Wet diaphragm-style
Front Suspension: 48mm KYB AOS closed cartridge
Rear Suspension: KYB 50mm shock
Front Travel: 12"
Rear Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Front Wheel: 21"
Rear Wheel: 19"
Tires: Dunlop Geomax MX34
Seat Height: 37.2"
Ground Clearance: 13.4"
Fuel Capacity: 1.85 gallons
Dry Weight: 220.5 lbs
Massive torque. Lightweight two-stroke character. Built to dominate the track.
The 2027 Beta RX 350 2-Stroke brings big-bore two-stroke performance to Beta's motocross lineup. Its 351.7cc liquid-cooled single-cylinder engine combines a 78mm bore with a 73.6mm stroke, delivering the strong torque and horsepower that make the 350 RX unique in the motocross world.
Beta designed the RX 350 around a linear and controllable power delivery, giving riders access to its substantial power without sacrificing the rideability expected from a modern Beta. The engine features a Beta Progressive Valve (BPV) power valve, counterbalancer, twin-plug cylinder head, Keihin PWK 38mm carburetor, electric start and a 5-speed transmission.
Engine: 351.7cc liquid-cooled 2-stroke
Bore x Stroke: 78mm x 73.6mm
Compression Ratio: 12.45:1
Power Valve: Beta Progressive Valve (BPV)
Cylinder Head: Twin-plug
Carburetor: Keihin PWK 38mm
Lubrication: Premix
Starting: Electric start
Transmission: 5-speed
Clutch: Wet diaphragm-style
Front Suspension: 48mm KYB AOS closed cartridge
Rear Suspension: KYB 50mm shock
Front Travel: 12"
Rear Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Front Wheel: 21"
Rear Wheel: 19"
Tires: Dunlop Geomax MX34
Seat Height: 37.2"
Ground Clearance: 13.4"
Fuel Capacity: 1.85 gallons
Dry Weight: 220.5 lbs