APRILIA RS 50

Engine type
Liquid cooled, single cylinder two stroke

Bore and stroke
39.86 x 40 mm

Displacement
49.9 cc

Compression ratio
11.5 :1

Carburettor
Dell’Orto PHVA - Ø14

Ignition
Electronic C.D.I.

Starting
Electric

Battery
12 V – 4 Ah

Lubrication
Automatic mixer

Gearbox
6 speed.
Ratios: 1st 11/34; 2nd 15/30; 3rd 18/27; 4th 20/24; 5th 22/23; 6th 23/22

Primary drive
Gears. Ratio: 21/78

Final drive
Chain. Ratio: 14/53

Clutch
Multi-plate

Exhaust emissions
Euro 2

Frame
Aluminium twin beam frame with extruded profiles and internal reinforcement

Front suspension
40 mm upside down fork; wheel travel 120 mm

Rear suspension
Double reinforced member aluminium swingarm with bracing arch; hydraulic monoshock; wheel travel 110 mm

Brakes
Front: radial caliper with two 28 mm opposed pistons; 300 mm stainless steel disc; aeronautical braided brake hose
Rear: 180 mm stainless steel disc; caliper with two 25 mm opposed pistons; aeronautical braided brake hose

Wheels
Light alloy 6 ‘Y’ spoke wheels with tubeless rims.
Front: 2.75 x 17"
Rear: 3.50 x 17"

Tyres
Front: 110/80 - 17"
Rear: 130/70 - 17"

Dimensions
Overall length 1965 mm
Overall width 720 mm
Max height at windshield 1.100 mm
Seat height 810 mm
Wheelbase 1,310.5 mm

Tank capacity
13 litres