Friday, 20 April 2012


EngineLiquid cooled, single cylinder two stroke. Aluminium cylinder with Nikasil coated liner. Read valve intake. Separate lubrication. Homologated to Euro 3 standards.
FuelDell’Orto VHSB 28
Bore x Stroke54 x 54,5 mm
Total displacement124,8 cc
Compression ratio12,5 ± 0,5:1
Fuel systemDell’Orto VHST 28.
IgnitionElectronic CDI ignition.
Generator12V - 180 W
LubrificationSeparate mixing with variable displacement, volumetric pump.
Gear box6 speed. 1st 10/30 (0.33) 2nd 14/29 (0.48) 3rd 17/27 (0.63) 4th 19/25 (0.76) 5th 21/24 (0.87) 6th 22/23 (0.67)
ClutchMulti-plate in oil bath.
Primary driveGearbox: 63/19 (3.31).
Final driveChain: 17/40 (2.35).
FrameSloping twin-spar frame in thin wall box section cast aluminium, with reinforcement cross-ribbing.
Front suspensionUpside down hydraulic fork, Ø 40 mm. Wheel travel 120 mm.
Rear suspensionSwingarm with asymmetric members in thin wall box section cast aluminium. Hydraulic monoshock with adjustable spring preload. Wheel travel 120 mm.
BrakesFront: Floating Ø 320 mm disc. Radial caliper with four differential diameter pistons, Ø 32 mm – Ø 27 mm. Rear: Single Ø 220 mm disc. Caliper with two Ø 30 mm pistons.
WheelsAluminium alloy. Front 3.00 x 17”; rear 4,00 x 17”.
TyresTubeless radial. Front 110/70 17”; rear 150/60 17”.
DimensionsOverall length 1955 mm Overall width (at handlebars) 720 mm Overall height (at windshield) 1100 mm Seat height 805 mm Wheelbase 1345 mm
Fuel tank capacity14 litres (3.5 litre reserve).
CarburettorThe 21 kW RS 125 (sold on the German market) is still equipped with a Dell’Orto PHBH 28 carburettor and is homologated to Euro 2 standard.

see more Aprilia RS 125 posts here 

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