1998 Aprilia RS 250

Make Model	Aprilia RS 250
Year	1998 - 99
Engine	Two stroke, 90° V twin-cylinder, with laminar suction and exhaust valve. Separate lubrication with variable automatic mixer
Capacity	249 cc / 15.2 cu in
Bore x Stroke	56 x 50.6 mm
Cooling System	Liquid cooled
Compression Ratio	12.0:1 (+/- 0.7)
Lubrication	Oil pump with separate circuit
Induction	2 x Ø34 mm Mikuni 34 SS flat side carburetors
Fuel Type	Lead-free petrol, R.O.N. minimum 95
Engine Oil Recommendation	IP MAX 2T COMPETITION, or any high-quality oil meeting the ISO-L-ETC++ or API TC++ specifications
Air Filter	With polyurethane filter element
Ignition	CDI
Battery	12V 4Ah
Starting	Kick
Max Power	52.9 kW / 72.5 hp @ 11900 rpm
Max Power Rear Tyre	47.2 kW / 64.3 hp @ 10400 rpm
Max Torque	40 Nm / 4.08 kgf-m / 29.5 lb/ft @ 10750 rpm
Clutch	Oil bath, multiple-disc, with lever control on handlebars
Transmission	6 Speed, direct drive
Gear box oil Recommendation	IP FC, SAE 75W-90, or any high-quality oil meeting the API GL-4 specification
Final Drive	Chain, sealed, jointless, DID 520 V6
Gear Change	With pedal (L), 1st low, other 5 high
Final Reduction	14:42 (1:3.0)
Gear Ratio	1st 11:27 (1:2.454) / 2nd 16:26 (1:1.625) / 3rd 17:21 (1:1.235) / 4th 22:23 (1:1.045) / 5th 24:22 (1:0.916) / 6th 25:21 (1:0.840)
Primary Reduction	23:59 (1:2.565)
Front Suspension	Ø40 mm Inverted fork with adjustable rebound and compression damping.
Front Wheel Travel	120 mm / 4.7 in
Rear Suspension	Magnesium alloy swingarm. Monoshock with resevoir, adjustable extension, compression and spring preloading.
Rear Wheel Travel	130 mm / 5.1 in
Front Brakes	2 x Ø298 mm discs, 4 piston calipers
Rear Brakes	Single Ø220 mm disc, 2 piston caliper
Front Wheel	3.50 x 17
Rear Wheel	4.50 x 17
Front Tyre	120/60-17
Rear Tyre	150/60-17
Rake	25°
Turning circle Ø	4.09 m / 13.4 ft
Dimensions	Length: 1880 mm / 74.0 in Width: 690 mm / 27.2 in Height: 1080 mm / 42.5 in
Wheelbase	1370 mm / 53.9 in
Seat Height	810 mm / 31.9 in
Ground Clearance	135 mm / 5.3 in
Dry Weight	141 kg / 309 lbs
Wet Weight	167 kg / 368 lbs
Fuel Capacity	16.5 Litres / 4.4 US gal
Reserve	3.5 Litres / 0.9 US gal
Braking 60 km/h / 37 mph - 0	12.9 m / 42.3 ft
Braking 100 km/h / 62 mph - 0	36.8 m / 120.7 ft
Standing ¼ Mile	12.50 sec / 172.5 km/h / 107.2 mph
Top Speed	209.5 km/h / 130.2 mph
Road Test	Tuttomoto Test Bimota V-DUE vs Suzuki GSX-R750WT vs Aprilia RS250

The RS250 was designed by Aprilia to resemble their GP250 bike to celebrate their success in the championship. The Aprilia RS250 is powered by a modified Suzuki RGV250 (VJ22) engine which is prepared by Aprilia, changes include a revised ECU, Aprilia-designed expansion chambers, barrels and airbox. The twin 34 mm flat slide Mikuni carburettors are retained from the RGV.

Chassis

The frame is a cast twin spar aluminium/magnesium alloy with thin-walled monocoque reinforcements, with the engine as a fully stressed member manufactured by Benelli for Aprilia. The banana swingarm is made out of the same polished aluminium alloy as the rest of the frame. The reason for the swingarm's banana shape is to allow the expansion chambers to run unobstructed under the engine to improve ground clearance in turns.

The forks are 41 mm Showa (on the MY98+ models) inverted units and are adjustable compression and rebound, the rear suspension is a Sachs mono-shock which is adjustable for preload, compression and rebound. The front brakes of the RS 250 are Brembo dual 298 mm discs with Brembo Oro four-piston calipers. The rear brake is a single 220 mm disc with a Brembo twin-piston caliper.

The front & rear rims are lightweight, 5 spokes, cast aluminum rims are 3.50x17 up front (3.0x17 on the older models) and 4.50x17 out back that require tires of 120/70x17 and 160/60x17, respectively.

Instrument panel

The RS gauges feature a digital instrument panel that gives the rider a variety of information. It will display maximum and average speed readings in kilometers or miles per hour, an adjustable rev limiter warning zone indicator, water temperature in choice of scale, battery charge indicator, a clock, and a chronometer that can remember up to 40 lap times.

Revision

In 1998, Aprilia released an all new look for the RS250, also referred to as RS250GP1 to celebrate Aprilia's victory in the 250 cc GP racing class. Its appearance is similar to Marco Melandri's RSWGP250 bike, with the same engine and frame as the pre-1998 model. The bike has a dummy ram-air intake. Changes include:

- Revised overall bike styling with more modern senses.
- New Showa front forks and adjustable rear ride height
- New style instrument panel with new functionality.
- New rims and tyres: the front rim is now a 3.5x17, instead of 3.0x17 as used on pre-1998 model. The front tire is a 120/60x17 instead of the 110/70x17 mounted on the pre-1998

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