Aprilia RS50

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Aprilia RS50

Manufacturer	Aprilia
Class	Sport bike
Engine	50cc Single cylinder two-stroke, liquid cooled
Wheelbase	1280mm
Dimensions	L 1920mm W 675mm (at handlebars) H 1115mm (at windshield) 810mm (seat height)
Similar	Derbi GPR50

The Aprilia RS50 is a GP derived replica sport production motorcycle made by Aprilia. It is powered by a single cylinder 2-stroke aluminium cylinder block, liquid cooled 50cc AM6 engine. The bike is popular in countries that have restrictions on motorcycle engine size. The bike is 7/8ths the size of the average bike and is perfect for smaller or shorter riders. At 175lbs. dry weight, it can be supported by almost anyone. It is a favorite among teenage riders for this reason.^{[citation needed]}

[edit] Specifications

Engine

Single cylinder two-stroke, liquid cooled. Light alloy cylinder with Gilnisil coating. Reed intake in crankcase. Balancing countershaft.
- Bore By Stroke: 40.3 x 39 mm.
- Displacement: 50cc
- Compression Ratio: 12 ± 0.5:1
- Carburettor: Dell’Orto PHBN 12 - HS.
- Ignition: Electronic, capacitor discharge
- Starting Method: Electric
- Alternator: 12V – 105W
- Lubrication: Separate mixing with variable displacement, volumetric pump.
- Power: 9HP
- Top Speed: 50-60mph depending on rider and year of bike's manufacture.

Gear box

Six speed Primary drive Gear Final drive Chain

Final drive

Chain: 12/47 (2.55)

Clutch

Multi-disc in oil bath.

Frame

Cast aluminium, reinforced box section, sloping twin-spar frame.

Suspension

Front suspension: ø 35 mm central pin hydraulic telescopic fork, wheel travel 110 mm
Rear suspension: Double member swing-arm in high strength steel with hydraulic monoshock, wheel travel 120 mm