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Technical Overview
2006 Beta Jonathan 350 Technical Analysis & Specification Breakdown
At the heart of the 2006 Beta Jonathan 350 custom - cruiser motorcycle, Beta pairs a 349 cc (21.3 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 79.0 x 71.2 mm (3.1 x 2.8 inches).
On the scales, the Jonathan 350 measures 138 kg (304 lbs) dry. Rider ergonomics and chassis geometry center around a 740 mm (29.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,470 mm (57.9 in) wheelbase engineered for balanced agility and highway composure. The 19-liter (5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Standover Height
740 mm (29.1 in)
Engine
Displacement349.0 ccm (21.30 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Bore x Stroke79.0 x 71.2 mm (3.1 x 2.8 inches)
Valves/Cylinder4
Fuel SystemCarburettor. Mikuni BST 33
Fuel ControlSingle Overhead Cams (SOHC)
CoolingAir
Transmission
Gearbox6-speed
ClutchWet multi-disc clutch
Chassis
Frame TypeSteel
Front SuspensionHydraulic fork
Front Travel120 mm (4.7 inches)
Rear SuspensionMonoshock with adjustable spring preload
Rear Travel100 mm (3.9 inches)
Wheelbase1470 mm (57.9 inches)
Ground Clearance240 mm (9.4 inches)
Wheels & Brakes
Front Tyre120/80-16
Rear Tyre140/90-15
Front BrakesSingle disc
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight138.0 kg (304.2 pounds)
Seat Height740 mm (29.1 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
