Overview

2026 Beta RX350

Motorcycle

350 RX

350 RX: All new for 2026, this new model replaces the 300 version for the 2026 season. New engine cases, bore and stroke, as well as a twin-plug head to ignite the special power only a big-bore 2-stroke can provide. The longer crankshaft, combined with the final gearing ratio of 14/47, provides a large amount of torque and overall horsepower that will turn some heads. This new 350 motocrosser will thrive in many different track conditions. Clearly in a class of its own!


 

Specs and Features

Specifications
ENGINE TYPE
Beta Built single cylinder, 2-stroke, liquid cooled, with BPV power valve system and counter balancer, electric start with back-up kick starter sold as an option
BORE
78mm
STROKE
73.6mm
DISPLACEMENT
351.7cc
COMPRESSION RATIO
12:45:1
VALVE TRAIN
Beta Progressive Valve (BPV)
IGNITION
AC-CDI Kokusan
SPARK PLUG
Dual MR7CI8
LUBRICATION
Pre-Mix
FUEL SYSTEM
Keihin PWK 38mm
CLUTCH
Wet Diaphragm-style
TRANSMISSION
5 Speed
FINAL DRIVE
O-ring chain
FRAME
Molybdenum steel / Double Cradle w/ quick air filter access
WHEELBASE
58.7"
SEAT HEIGHT
37.2"
GROUND CLEARANCE
13.4
FOOTREST HEIGHT
16.6"
DRY WEIGHT
220.5 lbs (wet weight, no fuel)
FUEL TANK CAPACITY
1.5 US Gallons
FRONT SUSPENSION
48 mm KYB AOS Closed Cartridge with adjustable compression & rebound
REAR SUSPENSION
KYB 50 mm body with adjustable rebound and high/low speed on compression adjustment
FRONT WHEEL TRAVEL
12.0"
REAR WHEEL TRAVEL
11.8"
FRONT BRAKE
260 mm floating rotor
REAR BRAKE
240 mm rotor
FRONT/REAR RIM
21" (Front) 19" (Rear)
FRONT/REAR TIRE
80/100 | 120/80
SPECS
*Specifications subject to change without notice. Additional information on all models including manuals, accessories and parts books are available online at www.betausa.com under SUPPORT.
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