350 RX
The Beta 350 RX 2-Stroke is built to bring big-bore two-stroke power to the motocross track — combining a massive 352cc engine, strong low-to-midrange torque, and a lightweight race-focused chassis into a machine that's unlike anything else in the class. Its all-new liquid-cooled two-stroke engine features a dual-spark-plug cylinder head, Beta Progressive Valve (BPV) power valve system, counter balancer, and Keihin PWK 38mm carburetor, delivering the strong, broad power that makes a 350cc two-stroke so unique while keeping the bike predictable and manageable. The five-speed transmission and 14/47 final gearing put that power to the ground effectively, while electric start means getting back on the gate is as simple as pushing a button. At roughly 220 lbs dry, the 350 RX combines its big-bore engine with a chromoly steel chassis, KYB 48mm closed-cartridge forks with 12 inches of travel, and a fully adjustable KYB rear shock with 11.8 inches of travel. Add 260mm front and 240mm rear brakes, full-size 21"/19" wheels, Xtrig FlexFix handlebar mounts, and no-tools air-filter access, and the 350 RX is a serious motocross machine built around one goal: delivering the torque and character of a big-bore two-stroke with the control and rideability to put it to work on the track.
Engine: Beta-built single-cylinder, 2-stroke, liquid-cooled, counter-balanced
Displacement: 351.7cc / 352cc
Bore x Stroke: 78mm x 73.6mm
Power Valve: Beta Progressive Valve (BPV), adjustable
Cylinder Head: Dual spark plug
Fuel System: Keihin PWK 38mm carburetor
Lubrication: Pre-mix
Ignition: AC-CDI Kokusan
Clutch: Wet diaphragm-style, hydraulic
Transmission: 5-speed
Final Drive: O-ring chain, 14/47 gearing
Starting: Electric start; optional backup kick starter
Weight: 220.5 lbs / 100 kg dry
Frame: Molybdenum steel double-cradle
Seat Height: 37.2"
Ground Clearance: 13.4"
Wheelbase: 58.7"
Fuel Capacity: 1.5 gallons
Front Suspension: 48mm KYB AOS closed-cartridge fork, compression and rebound adjustable
Rear Suspension: KYB 50mm shock, rebound and high/low-speed compression adjustable
Front Wheel Travel: 12.0"
Rear Wheel Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Wheels: 21" front / 19" rear
Tires: 80/100-21 front / 120/80-19 rear
Key Features: Dual-spark cylinder head, BPV power valve, counter-balanced engine, electric start, KYB suspension, Xtrig FlexFix bar mounts, quick-access air filter
The Beta 350 RX 2-Stroke is built to bring big-bore two-stroke power to the motocross track — combining a massive 352cc engine, strong low-to-midrange torque, and a lightweight race-focused chassis into a machine that's unlike anything else in the class. Its all-new liquid-cooled two-stroke engine features a dual-spark-plug cylinder head, Beta Progressive Valve (BPV) power valve system, counter balancer, and Keihin PWK 38mm carburetor, delivering the strong, broad power that makes a 350cc two-stroke so unique while keeping the bike predictable and manageable. The five-speed transmission and 14/47 final gearing put that power to the ground effectively, while electric start means getting back on the gate is as simple as pushing a button. At roughly 220 lbs dry, the 350 RX combines its big-bore engine with a chromoly steel chassis, KYB 48mm closed-cartridge forks with 12 inches of travel, and a fully adjustable KYB rear shock with 11.8 inches of travel. Add 260mm front and 240mm rear brakes, full-size 21"/19" wheels, Xtrig FlexFix handlebar mounts, and no-tools air-filter access, and the 350 RX is a serious motocross machine built around one goal: delivering the torque and character of a big-bore two-stroke with the control and rideability to put it to work on the track.
Engine: Beta-built single-cylinder, 2-stroke, liquid-cooled, counter-balanced
Displacement: 351.7cc / 352cc
Bore x Stroke: 78mm x 73.6mm
Power Valve: Beta Progressive Valve (BPV), adjustable
Cylinder Head: Dual spark plug
Fuel System: Keihin PWK 38mm carburetor
Lubrication: Pre-mix
Ignition: AC-CDI Kokusan
Clutch: Wet diaphragm-style, hydraulic
Transmission: 5-speed
Final Drive: O-ring chain, 14/47 gearing
Starting: Electric start; optional backup kick starter
Weight: 220.5 lbs / 100 kg dry
Frame: Molybdenum steel double-cradle
Seat Height: 37.2"
Ground Clearance: 13.4"
Wheelbase: 58.7"
Fuel Capacity: 1.5 gallons
Front Suspension: 48mm KYB AOS closed-cartridge fork, compression and rebound adjustable
Rear Suspension: KYB 50mm shock, rebound and high/low-speed compression adjustable
Front Wheel Travel: 12.0"
Rear Wheel Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Wheels: 21" front / 19" rear
Tires: 80/100-21 front / 120/80-19 rear
Key Features: Dual-spark cylinder head, BPV power valve, counter-balanced engine, electric start, KYB suspension, Xtrig FlexFix bar mounts, quick-access air filter