I'm thinking which bike I should buy,so you might help me expressing your opinion.
Aprilia RS 125Engine: 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
Kawasaki Ninja 250[spoiler]
Engine Four-stroke, liquid-cooled, DOHC, parallel twin
Displacement 249 cc
Bore x Stroke 62.0 x 41.2mm
Compression Ratio 11.6:1
Carburetor Keihin CVK30 x 2
Ignition TCBI with digital advance
Transmission Six-speed
Final drive O-Ring Chain
Cooling System Liquid
Frame Type Semi-double cradle, high-tensile steel
Rake/Trail 26 degrees / 3.2 in.
Front Tire Size 110/70-17
Rear Tire Size 130/70-17
Wheelbase 55.1 in.
Front Suspension / Wheel Travel 37mm hydraulic telescopic fork / 4.7 in.
Rear Suspension / Wheel Travel Bottom-Link UNI-TRAK® with 5-way adjustable preload / 5.1 in.
Front Brakes Single 290mm hydraulic petal disc with two-piston caliper
Rear Brakes Single 220mm petal disc with two-piston caliper
Fuel Capacity 4.8 gal.
Seat Height 30.5 in.
Curb Weight 374.9 lbs.
Overall Length 82.1 in.
Overall Width 28.1 in.
Overall Height 43.7 in.
Color Choices Ebony, Lime Green / Ebony (SE), Pearl White / Ebony (SE)
Warranty 12 months
Good Times™ Protection Plan 12, 24, 36, 48 months

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