The Honda NSR250R is a street-legal road-orientated 249cc

two stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of t ...

sport bike A sport bike (sports motorcycle, or sports bike) is a motorcycle designed and optimized for speed, acceleration, braking, and cornering on asphalt concrete race tracks and roads. They are mainly designed for performance at the expense of comfor ...

produced by Honda Motor Co., Ltd between 1987 and 1999. It evolved from the popular NS250R MC11 and was produced over four distinct generations, each powered by liquid-cooled,

reed valve Reed valves are a type of check valve which restrict the flow of fluids to a single direction, opening and closing under changing pressure on each face. Modern versions often consist of flexible metal or composite materials (fiberglass or carbon f ...

inducted 249cc 90°

V-twin A V-twin engine, also called a V2 engine, is a two-cylinder piston engine where the cylinders share a common crankshaft and are arranged in a V configuration. Although widely associated with motorcycles (installed either transversely or longit ...

two stroke engines. All engines incorporated the Honda RC-Valve power valve system, and nikasil-sulfur lined cylinder bores (hence the 'NS' in 'NSR'). The road going NSRs were built in the image of the

Honda RS250R The Honda RS250R was a race motorcycle manufactured by Honda to race in the 250cc class of the Grand Prix motorcycle World Championship. It was conceived as a ''production racer'' for customer teams and privateer riders, while factory-supported te ...

(also known as the NSR250) production race motorcycle series, although they shared no mechanical parts. This was in the style of competing factories Yamaha and Aprilia.

MC16

1987 NSR250R MC16 1987 Ignition System: CDI
1987 Swing-Arm: Straight with Rear Brake Lug

MC18

1988 NSR250R MC18 R2j
1988 NSR250R SP R4j Rothmans MC18 1988 Ignition System: PGM-I
1988 Swing-Arm: Straight with Rear Brake Lug
1989 NSR250R MC18 R5k
1989 NSR250R SP MC18 R6k 1989 Ignition System: PGM-II
1989 Swing-Arm: Straight (Rear Brake Arm used, so no lug)

Engine/Gearbox

MC18 R5k

The engine is a 249cc 90° V-twin liquid-cooled two-stroke with crankcase

induction via twin naturally aspirated carburetors.
Bore and Stroke: 54mm × 54.5mm The gearbox is a six-speed constant mesh cassette type with multi-plate

wet clutch A clutch is a mechanical device that engages and disengages power transmission, especially from a drive shaft to a driven shaft. In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts). ...

MC18 R6k

The engine is the same as the R5k. The only difference is that it has a dry multi-plate clutch.

Suspension

MC18 R5k

Front: Twin telescopic forks. Oil-filled damper with spring preload adjustment only.
Rear: Single rising rate shock. Pro-Link with external coil. Variable spring preload adjustment only.

MC18 R6k

Front: Twin telescopic forks. Oil-filled damper cartridge with spring preload and rebound damping adjustment.
Rear: Single rising rate rear shock. Pro-Link with external coil. Gas/oil damper with variable spring preload. Rebound and compression damping adjustment.

MC21

1990 NSR250R MC21
1990 NSR250R SP MC21
1991 NSR250R MC21
1991 NSR250SE MC21
1992 NSR250R MC21
1992 NSR250R SP MC21
1992 NSR250SP Rothmans MC21
1993 NSR250SE MC21
1991-93 Ignition System: PGM-III
1991-93 Swing Arm: "Gull Arm" Right side curved to accommodate exhaust pipes

MC28

1994 NSR250R MC28
1994 NSR250R SP Rothmans
1994 NSR250SE MC28
1995 NSR250R SP HRC
1996 NSR250R SP Repsol
1996 NSR250SE MC28
1994-96 Ignition System: PGM-IV
1994-96 Swing-Arm: "Pro-Arm" single sided.

References

{{DEFAULTSORT:Honda Nsr250r NSR250 Sport bikes Two-stroke motorcycles Motorcycles introduced in 1985