1991 Honda NSR 250SE MC21

Make Model	Honda NSR 250SE MC21
Year	1991
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	7.3 : 1
Induction	TA20 Carburetor Type
Lubrication	Seperate Pump (engine) splash type (transmission)
Ignition	PGM-CDI
Starting	Kick
Max Power	45 hp / 32.8 kW @ 9500 rpm
Max Torque	35 Nm / 25.8 ft-lb @ 8500 rpm
Clutch	Multi-plate, coil spring
Transmission	Constant Mesh 6-speed
Final Drive	Chain
Gear Ratio	1st: 2.642 / 2nd: 1.800 / 3rd: 1.380 / 4th: 1.125 / 5th: 1.000 / 6th: 0.916
Frame	Aluminum tube type frame
Front Suspension	41mm 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	110/70-17 53 H
Rear Tyre	150/60-R18 67 H
Rake	23°15’
Trail	87 mm / 3.4 in
Dimensions	Length 1975 mm / 77.7 in Width 655 mm / 25.7 in Height 1060 mm / 41.7 in
Wheelbase	1345 mm / 52.9 in
Seat Height	770 mm / 30.3 in
Ground Clearance	135 mm / 5.3 in
Dry Weight	132 kg / 291.8 lbs
Wet Weight	151 kg / 337 lbs
Fuel Capacity	16 Litres / 4.2 US gal
Review	Type I / Type II / Technical / nsr250.net

The 1991 NSR Honda released a new model of the NSR. It was called the SE and now there were three types of models for sale. The standard model was plainly called the 250R model. It was available in only black with grey and silver accents. The R type was priced at 620,000 Yen and did not include the extra options as the SE and SP models. It was a lower cost alternative to the more expensive models and some people didn't care for the noisy chatter of the dry clutch. This was the first year for the SE ( Super Edition ) model. It was available in only one color of fighting red/white with blue and green distinguishing it from the regular R type model. The SE was priced higher at 660,000 Yen. The SE was made available because of the high price and scarceness of the SP models. SE version NSR's had the very cool dry clutch and the adjustable suspension for the front and rear plus SE markings. The SE was not sold with the light weight and expensive magnesium wheels due to the high cost. Honda continued making SP models for the street but they were pricey and limited to a few units. The 1991 SP was sold in Pentax racing colors, it had the light weight and highly priced Mag-Tek magnesium wheels which were made by Enkei, fully adjustable suspension for the front and rear plus the dry racing clutch. 1991 SP's were priced at 719,000 Yen. Production was limited to 1500 units so getting your hands on one of these will be tricky and probably pricey.