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Honda NSR 250R

Make Model	Honda NSR 250R MC18
Year	1988
Engine	Two stroke, 90°V-twin cylinder, reed valve/exhaust valve
Capacity	249 c / 15.2 cu-in
Bore x Stroke	54 x 54.5 mm
Cooling System	Liquid cooled
Compression Ratio	6.2 : 1
Lubrication	Injected 2-stroke oil
Exhaust	Expansion chamber, RC power valves
Induction	TA10A Carburetor Type
Ignition	CDI
Starting	Kick
Max Power	45 hp / 32.8 kW @ 9500 rpm
Max Torque	35 Nm / 25.8 ft-lb @ 8500 rpm
Clutch	Wet plate
Transmission	Constant Mesh 6-speed
Final Drive	Chain
Gear Ratio	1st: 2.846 / 2nd: 1.941 / 3rd: 1.500 / 4th: 1.272 / 5th: 1.136 / 6th: 1.045
Frame	Aluminum tube type frame
Front Suspension	Telescopic air valve semi-adjustable
Rear Suspension	Rear: Pro-Link Single shock swingarm non-adjustable
Front Brakes	2x discs 2 piston calipers
Rear Brakes	Single disc 1 piston caliper
Front Tyre	100/80-17 52 H
Rear Tyre	130/70-18 63 H
Rake	23°
Trail	87 mm / 3.4 in
Dimensions	Length 2035 mm / 80.1 in Width 705 mm / 27.7 in Height 1105 mm / 43.5 in
Wheelbase	1360 mm / 53.5 in
Seat Height	750 mm / 29.5 in
Ground Clearance	135 mm / 5.3 in
Dry Weight	125 kg / 275.5 lbs
Wet Weight	141 kg / 310.8 lbs
Fuel Capacity	16 Litres / 4.2 US gal
Road Test	Bike magazine Group test 1987
Related Links	Type I / Type II / Technical / nsr250.net

In 1988 the NSR was reworked with new bodywork and those familiar twin round brake lights, new electrical system , revised suspension , larger brakes, six spoke wheels with larger rubber and an even more peakier engine. The price had increased by 20,000 Yen to 579,000 Yen and it was renamed the MC18 by the factory. Computer controlled carburetors known as PGM II were introduced for the first time. (Many people say that 1988 was the best year for all the NSR's engines 50's, 80's and the 250's). The colors were the same as the MC16 NSR, fighting red/white and Terra blue/white.

However, more importantly is the significant improvements that have been made inside the engine. Carburetor sees a 4mm increase in bore to a 32mm bore, the operation of the carburetor is incorporated within the PGM unit which controls the solenoid valve in order to provide a precise response. The PGM also provides rapid engine management using a three dimensional map based on throttle position, engine RPM and ignition timing. In additional to visual improvements is the electronically controlled supply of engine oil. Also included are improvements to the RC Valves which have evolved for more accuracy, coated pistons to withstand higher output, dedicated oil pump and better position of the engine in the frame. As a result, performamnce is greatly increased at all ranges of engine speed. It also increases the control of RPM in all directions. Changes are also seen with the chassis which include a more forward and lower mounted engine, main diagonal 5 section tubular frame and hollow cast pivot section provided a highly rigid frame with extreme balance. Front forks have been increased to 41mm diameter. Front and rear radial tires are wider then the previous year.