Honda NSR250R
 |
 1989 Honda NSR250R (MC18 R5k in SEED livery) | |
| Manufacturer | Honda |
|---|---|
| Production | 1985–1996 |
| Predecessor | Honda NS250 |
| Class | sport bike |
| Engine | 249 cc (15.2 cu in), liquid Cooled, two-stroke, 90° V-Twin Crankcase Reed Valve Induction |
| Bore / stroke | 54 mm × 54.5 mm (2.13 in × 2.15 in) |
| Transmission | Six Speed constant mesh manual |
| Brakes | Drilled vented discs front and rear |
| Tires | Front: 110/70 × 17" Rear: 150/60 × 18" |
| Rake, trail | 23° 15', 87mm |
| Wheelbase | 1,345 mm (53.0 in) |
| Dimensions | L: 1,980 mm (78 in) W: 650 mm (26 in) H: 1,060 mm (42 in) |
| Seat height | 780 mm (31 in) |
| Fuel capacity | 17.2 L (3.8 imp gal; 4.5 US gal) |
| Oil capacity | 2.1 L (0.46 imp gal; 0.55 US gal) |
The NSR250R series is the road legal variant of the Honda NSR250 two-stroke race motorcycle series. It was manufactured between 1985 and 1996.
Models
1987 NSR250R MC16
1988 NSR250R MC18 R2
1988 NSR250R SP R4 Rothmans MC18
1989 NSR250R MC18 R5
1989 NSR250R SP MC18 R6
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
1994 NSR250R MC28
1994 NSR250R SP Rothmans
1994 NSR250SE MC28
1995 NSR250R SP HRC
1996 NSR250R SP Repsol
1996 NSR250SE MC28
Engine/Gearbox
MC18 R5k
The engine is a 249cc 90° V-twin liquid-cooled two-stroke with crankcase reed valve 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.
The MC18 crankshaft was sold as a complete assembly by Honda. Hence, individual crankshaft components were not readily available making it very difficult to rebuild the crankshafts. This crankshaft part is no longer an available part from Honda, which can make restoration of these machines difficult. However, these types of parts can often be found in the aftermarket.
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.