These are the known mechanical and performance specifications for your 2011 Sym Allo 125.
Basic Specs

Engine
Displacement124.60 ccm (7.60 cubic inches)
TypeElectroplated ceramic cylinder
DetailsSingle cylinder, four-stroke
Max RPM
Compression
Bore/Stroke
Valves/Cylinder
FuelingCarburettor
IgnitionCDI
Exhaust
Lubrication
CoolingAir
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity5.20 litres (1.37 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionTelescopic Fork
Front Travel
Rear SuspensionUnit Swing Arm
Rear Travel
Seat2-person seat
Seat Height
Alt. Seat Height
Total Height1,125 mm (44.3 inches)
Total Length1,905 mm (75.0 inches)
Total Width690 mm (27.2 inches)
Ground Clearance
Wheelbase1,310 mm (51.6 inches)
Dry Weight100.0 kg (220.5 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre110/70-12
Rear Tire/Tyre120/70-12
Front BrakesSingle disc
Front Brake Diameter180 mm (7.1 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter110 mm (4.3 inches)
Wheels
Comments
Made in Taiwan.