The Aprilia RS250 is a two-stroke sport bike of the RS series made by the Italian motorcycle manufacturer Aprilia.
The Aprilia RS250 is a race oriented motorcycle with technology derived from Aprilia's racing experience. It is inspired by the Aprilia RSW250 Grand Prix motorcycle used by riders such as Valentino Rossi, Max Biaggi and Loris Capirossi in MotoGP races.
History
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 for preload, compression and rebound, the rear suspension is a Sachs mono-shock which is also 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. They are 3.50x17 up front (3.00x17 on the older models) and 4.50x17 out back that require tires of 110/70ZR17 or 120/60ZR17 (only MY98+) and 150/60ZR17 or 160/60ZR17, 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 3.50x17, instead of 3.00x17 as used on pre-1998 model. The factory mount front tire is a 120/60ZR17 instead of the 110/70R17 mounted on the pre-1998 +Technical specifications Aprilia RS 250Model Year1994 – 19971998 – 2003TypeLD00LDA0Fairing"Mk I""Mk II"VINZD4LD00…ZD4LDA0…Battery12 V, 4 AhStarterKickstarterEngineLiquid cooled, twin cylinder V-90°, two stroke (Suzuki VJ22A) with reed valve intake and exhaust valveDisplacement249.25 ccBore / Stroke56 mm / 50.6 mmClutchMulti plate in oil-bathCompression ratio12 ± 0.7:1Power45 kW / 60.35 hp @ 11000/min46 kW / 61.69 hp @ 11000/minTorque39.7 Nm @ 10750/min40 Nm @ 11000/minPower/Weight ratio0.2778 kW/kg0.2754 kW/kgCarburettor2× Mikuni TM 34 SS flat slideIgnition system / Spark plugDigital capacitor discharge ignition (CDI) SAPC 22D70 CM7422 22c / NGK BR9ECMDigital capacitor discharge ignition (CDI) SAPC 22D70 CM7423 23c / NGK BR9ECMSpark advance14° BTDC @ 1300/min10° ±2° BTDC @ 1300/minExhaust valve systemElectronic, three part exhaust slideResonance chamber / SilencerLD e3 89/235 *0009*00 / LD e3 89/235 *0009*00LD e3 89/235 *0009*00 / LD e11 0066Noise emissions: stationary / in motion90 dB(A) @ 5500/min / 80 dB(A)89 dB(A) @ 5500/min / 80 dB(A)Final drive ratio (chain)14:42 TeethGear ratios1. gear 11 / 27 = 1: 2.454 2. gear 16 / 26 = 1: 1.625
3. gear 17 / 21 = 1: 1.235
4. gear 22 / 23 = 1: 1.045
5. gear 24 / 22 = 1: 0.916
6. gear 25 / 21 = 1: 0.840Primary drive ratio23/59 = 1 : 2.565Top speed200 km/h210 km/hDry weight141 kg140 kgWet weight162 kg167 kgMax. laden mass337 kg347 kgFuel capacity16.5 l (incl. 3.5 l reserve)19.5 l (incl. 3.6 l reserve)Two stroke oil capacity1.6 l (incl. 0.6 l reserve), rear mounted1.6 l (incl. 0.3 l reserve), front mountedCooling system capacity1.9 l (rear mounted)1.9 l (front mounted)Length / width / height1980 mm / 690 mm / 1090 mm1975 mm / 690 mm / 1180 mmGround clearance135 mmSeat height810 mmWheelbase1370 mm1360 mmRake25° 30'Trail102 mmWheel travel front / rear120 mm / 130 mmFront forksMarzocchi Up-Side-Down forks, adjustable, 40 mm diameter 20 mm axle, spring only in the left damping in the right fork legShowa Up-Side-Down forks, adjustable, 41 mm diameter 25 mm axle, springs and damping elements in both legsRear shockSachs Mono-Shock with adjustable preload, compression and rebound. APS Linkage systemFrameCast Aluminium-Magnesium-Alloy (polished/brushed), twin spar, torsional stiffness like Grand Prix RSV 250 (197 kgm/1°)SwingarmBanana swing arm, cast Aluminium-Magnesium-Alloy (polished/brushed), torsional stiffness (162 kgm/1°)Rear subframeSteelAluminiumBrake disc front / rear2× 298 mm / 220 mmFront brake pumpBrembo PS16Brembo PSC16Front brake caliper mounting distance40 mm65 mmSpeedometerFront wheel (mechanical)Rear wheel (hall sensor)Tiresf: 110/70 ZR17 r: 150/60 ZR17 or 160/60 ZR17f: 110/70 ZR17 or 120/60 ZR17 r: 150/60 ZR17 or 160/60 ZR17Rimsf. 3.00″x17″ r. 4.50″x17″f. 3.50″x17″ r. 4.50″x17″Misc.Frame bracket prepared for the assembly of a steering damper, lap-timer/stop watch, some bikes have the badge „Aprilia Racing Division Work Bikes Dept.“ with stamped VIN attached to the frameFrame bracket prepared for the assembly of a steering damper, lap-timer/stop watch, adjustable shift indicator (new instrument panel)
References