Engine: Liquid cooled, single cylinder two stroke. Aluminium cylinder with Nikasil coated liner. Read valve intake. Separate lubrication. Homologated to Euro 3 standards. -Fuel: Dell’Orto VHST 28 -Bore x Stroke: 54 x 54,5 mm -Total displacement: 124,8 cc -Compression ratio: 12,5 ± 0,5:1 -Fuel system: Dell’Orto VHST 28. -Ignition: Electronic CDI ignition. -Starting: Electric -Generator: 12V - 180 W -Lubrification: Separate mixing with variable displacement, volumetric pump. -Gear box: 6 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) -Clutch: Multi-plate in oil bath. -Primary drive: Gearbox: 63/19 (3.31). -Final drive: Chain: 17/40 (2.35). -Frame: Sloping twin-spar frame in thin wall box section cast aluminium, with reinforcement cross-ribbing. -Front suspension: Upside down hydraulic fork, Ø 40 mm. Wheel travel 120 mm. -Rear suspension: Swingarm with asymmetric members in thin wall box section cast aluminium. Hydraulic monoshock with adjustable spring preload. Wheel travel 120 mm. -Brakes: Front: 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. -Wheels: Aluminium alloy. Front 3.00 x 17”; rear 4,00 x 17”. -Tyres: Tubeless radial. Front 110/70 17”; rear 150/60 17”. -Dimensions: Overall length 1955 mm Overall width (at handlebars) 720 mm Overall height (at windshield) 1100 mm Seat height 805 mm Wheelbase 1345 mm -Fuel tank capacity: 14 litres (3.5 litre reserve). -Carburettor: The 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.