Honda NSR250R

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Honda NSR250R
1989 Honda NSR250R (MC18 R5k in SEED livery)
Manufacturer Honda
Production 1984–1996
Predecessor Honda NS250
Class sport bike
Engine

249cc 90° V-Twin Liquid Cooled Two-Stroke

Crankcase Reed Valve Induction
Top speed 185km/h(45HP) 215km/h(60HP)
Power 45HP @ 9500 rpm (60HP when de-restricted)
Torque 37Nm @ 8000 rpm
Transmission Six Speed constant mesher
Suspension None
Brakes Drilled vented discs front and rear
Tires

Front: 110/70 × 17"

Rear: 150/60 × 18"
Rake, trail 23° 15', 87mm
Wheelbase 1345mm
Dimensions L: 1980mm
W: 650mm
H: 1060mm
Seat height 780mm
Weight 131kg (dry)
Fuel capacity 17.2 litre
Oil capacity 2.1 litre

History[edit]

The NSR250 series of two stroke motorcycles were manufactured between 1985 and 1996.[1]

Models[edit]

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

Specifications[edit]

Configuration: 90° v-twin
Displacement (cm³): 249
Mass (kg): 132 (dry)
Rider seat height (mm): 780
Power (kW (hp)): 32.8 (45)

Engine/Gearbox[edit]

1989 MC18 Crankshaft Assembly

MC18 R5k[edit]

The engine is a 249cc 90° V-twin liquid cooled 2-stroke with crankcase reed valve induction via twin naturally aspirated carburetors.
Bore and Stroke: 54mm × 54.5mm The gearbox is a 6 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[edit]

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

Suspension[edit]

MC18 R5k[edit]

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[edit]

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.

References[edit]

  1. ^ NSR-World.com/History

External links[edit]

  • nsr250.freeforums.org - Discussion forums dedicated to the Honda NSR250R
  • NSR-World.com gives a good general information on the Honda NSR250R
  • NSR250 forums Discussion forums dedicated to the Honda NSR250R