2021 Beta Evo 80 Junior Technical Analysis & Specification Breakdown
Positioned in Beta's trial motorcycle lineup, the 2021 Beta Evo 80 Junior pairs a 79.6 cc (4.9 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 48.0 x 40.8 mm (1.9 x 1.6 inches) with a 14.7:1 compression ratio.
Rider ergonomics and chassis geometry center around a 620 mm (24.4 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,210 mm (47.6 in) wheelbase engineered for quick, flickable steering geometry. The 2.5-liter (0.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Beta archive, this model family spans 3 indexed model years from 2010 to 2023, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
620 mm (24.4 in)
Engine
Displacement79.6 ccm (4.86 cubic inches)
Engine TypeSingle cylinder, two-stroke
Compression14.7:1
Bore x Stroke48.0 x 40.8 mm (1.9 x 1.6 inches)
Fuel SystemCarburettor. Dell´Orto PHBG 21
IgnitionHIDRIA
LubricationMix with fuel 1,5 % synthetic oil
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multi-disc
Chassis
Frame TypeSteel
Front SuspensionHydraulic fork with ø 33 mm shaft
Front Travel160 mm (6.3 inches)
Rear SuspensionMonoshock with adjustable spring preload
Rear Travel146 mm (5.7 inches)
Wheelbase1210 mm (47.6 inches)
Ground Clearance300 mm (11.8 inches)
Wheels & Brakes
Front Tyre2.5-19
Rear Tyre3.5-17
Front BrakesSingle disc
Front Brake Ø175 mm (6.9 inches)
Rear BrakesSingle disc
Rear Brake Ø150 mm (5.9 inches)
Dimensions & Weight
Seat Height620 mm (24.4 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.
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.
