Aprilia RS250

Aprilia RS250
Manufacturer	Aprilia
Production	95-04
Engine	250cc
Sparkplug	BR9ECM '03-04
Battery	YB4L-B '03-04
Front Tire	120/70-17 '03-04
Rear Tire	160/55-17 '03-04
Manuals	Service Manual
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The RS250 is that increasingly rare item: a current two-stroke production roadbike. Emissions legislation worldwide has made the large-capacity two-stroke engine a thing of the past, with its poor fuel consumption and excessively dirty exhaust emissions.

But Aprilia's RS250 continues to provide some of the purest motorcycling performance available. The heart of the bike is a rather outdated engine, Suzuki's RGV250 motor, first seen in 1989. It's a V-twin two-stroke, with several advanced power-boosting features, including guillotine-type power valves, electronically-controlled 34mm Mikuni flat-slide carburetors and ceramic-coated cylinders.

Aprilia modified the RGV's exhaust and intake systems to produce a power increase to 52kW (70bhp) at the crankshaft, equivalent to 280bhp/litre: the highest specific power output of any current production roadgoing motorcycle.

The rest of the bike is more than capable of handling this impressive power figure. A twin-spar aluminium frame provides super-stiff handling, and the fully-adjustable Showa upside-down front forks and rear monoshock allow a wide range of adjustment for any track or road situation. Wide sports tyres provide amazing grip, and the front twin Brembo four-piston calipers offer superlative stopping power, especially for a bike weighing just 140kg (2241b).

While the RS250's engine is based around a design that's more than a decade old, the styling is undoubtedly modern. A banana-style upswept aluminium swingarm and twin side-mounted exhausts pay tribute to the Grand Prix technology behind the RS, as well as providing a unique look.

Since Suzuki discontinued its RGV250, the RS250 has been unique in its class. The closest rivals to this mini-racebike are the four-cylinder 400cc four stroke machines like Honda's VFR400 and Kawasaki's ZXR400. But these heavier machines can't provide the ultimate cornering experience of the RS250, nor the exhilaration of the 250's screaming two-stroke acceleration.

Specifications

Make Model	Aprilia RS 250
Year	1995-96
Engine	Liquid cooled, two stroke, 90° V twin
Capacity	249
Bore x Stroke	56 x 50.6 mm
Compression Ratio	13.2:1
Induction	Mikuni TM 34 SS flat sides
Ignition / Starting	CDI digital
Max Power	72.5 hp 52.9 kW @ 11900 rpm (rear tyre 65.5 hp @ 11100 rpm)
Max Torque	40 Nm @ 10750 rpm
Transmission / Drive	6 Speed / chain
Front Suspension	40mm Inverted with adjustable rebound and compression damping. 120mm wheel travel.
Rear Suspension	Magnesium alloy swingarm. Monoshock with resevoir, adjustable extension, compression and spring preloading. 130mm wheel travel.
Front Brakes	2x 298mm discs 4 piston calipers
Rear Brakes	Single 220mm disc 2 piston caliper
Front Tyre	120/60 -17
Rear Tyre	150/60 -17
Dry-Weight	140 kg
Fuel Capacity	19.5 Litres
Consumption average	34 mp/h
Braking 60 - 0 / 100 - 0	12.9 m / 36.8 m
Standing ¼ Mile	12.50 sec / 172.5 km/h
Top Speed	209.5 km/h