Honda NSR250R

Last updated
Honda NSR250R
NSR 250 MC18 R5 Seed 005.jpg
1989 Honda NSR250R (MC18 R5k in SEED livery)
Manufacturer Honda
Production1987–1999
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)
Power 57 hp (43 kW) (unrestricted) [1]
Transmission Six Speed constant mesh manual chain drive
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)
DimensionsL: 1,980 mm (78 in)
W: 650 mm (26 in)
H: 1,060 mm (42 in)
Seat height780 mm (31 in)
Weight290 lb (132 kg) (dry)
330 lb (150 kg) (wet)
Fuel capacity17.2 L (3.8 imp gal; 4.5 US gal)
Oil capacity2.1 L (0.46 imp gal; 0.55 US gal)

The Honda NSR250R is a street-legal road-orientated 249cc two stroke sport bike produced by Honda Motor Co., Ltd between 1987 and 1999.

Contents

It evolved from the popular NS250R MC11 and was produced over four distinct generations, each powered by liquid-cooled, reed valve inducted 249cc 90° V-twin 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 (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 Honda NSR250R 1988.jpg
1988 NSR250R

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

Exploded view of MC21 crankshaft Honda NSR250 MC21-28 Crankshaft Assembly.pdf
Exploded view of MC21 crankshaft

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.

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.


Related Research Articles

The Honda XR series is a range of four-stroke off-road motorcycles that were designed in Japan but assembled all over the world.

<span class="mw-page-title-main">Honda VFR400</span> Type of motorcycle

The Honda VFR400 series of motorcycles were a related series of 399 cc V4-engined motorcycles, which were essentially scaled-down versions of the larger VFR race models of the day. They were mainly developed for, and sold in, the Japanese domestic market, in part due to the tougher motorcycle drivers' license restrictions in Japan at the time for bike exceeding 400cc.

<span class="mw-page-title-main">Honda VFR750F</span> Type of motorcycle

The Honda VFR750F is a motorcycle manufactured by Japanese automobile manufacturer Honda from 1986 to 1997.

The Honda CR series is a range of off-road motorcycles made by the Honda corporation from 1973 onwards.

<span class="mw-page-title-main">Honda F engine</span> Motor vehicle engine

The Honda F-Series engine was considered Honda's "big block" SOHC inline four, though lower production DOHC versions of the F-series were built. It features a solid iron or aluminum open deck cast iron sleeved block and aluminum/magnesium cylinder head.

The two-stroke power valve system is an improvement to a conventional two-stroke engine that gives a high power output over a wider RPM range.

<span class="mw-page-title-main">BMW R90S</span> Type of motorcycle

The BMW R90S is a 900cc sport motorcycle produced by BMW from 1973 to 1976. BMW commissioned designer Hans Muth to oversee the R90S, which became the flagship of the boxer engined "/6" range. Sporting distinctive two-tone paintwork, a bikini fairing and a new tail, the R90S was intended to shrug off the enduring image of BMW bikes as staid and utilitarian.

<span class="mw-page-title-main">Suzuki RGV250</span> Suzuki sport motorcycle

The Suzuki RGV250 was a Suzuki high performance sport bike which had a great number of its features and design cues based on Grand Prix technologies and ideas. It is a race-replica based on Suzuki's 250 cc (15 cu in) GP bikes from 1987 to 1998, the RGV V-2 racer. This motorcycle replaced the RG250 Gamma, which employed an alloy frame with a two-stroke parallel twin engine. The bike produced over 60 bhp in a narrow power band between 8,000 and 11,000 rpm. The dry weight ranged between 128 kg (282 lb) (1989) to 140 kg (309 lb) dry weight.

The Suzuki Boulevard S50 is a motorcycle manufactured by Suzuki and released in 2005 and production stopped in 2009. It features an 805 cc v-twin engine with four valves per cylinder. It was formerly named the Intruder 1985 - 1991 VS 700 (USA), 1985 VS 750 (worldwide) and VS 800.

<span class="mw-page-title-main">Honda RVF750 RC45</span> Type of motorcycle

The Honda RVF750R RC45 was a fully faired racing motorcycle created for homologation purposes for the Superbike World Championship by Honda Racing Corporation. The RVF750R was the successor to the VFR750R RC30. Like its predecessor, the RVF750R featured a DOHC liquid-cooled V4 4-stroke engine with gear driven cams and a single-sided swingarm, but unlike the RC30 it utilized electronic fuel injection, in a setup very similar to the production 1992 NR750. The US spec engine had a 749.2cc capacity and was rated at 101 horsepower; the European version was rated at 118 horsepower. A simple rewire modification to the PGM-FI box increased power in the US engine up to the 118 hp. It was manufactured from 1994 until 1995 and sold in limited numbers, followed by the VTR1000R SP-1 RC51 in 2000. Unlike the VFR750R RC30 and VFR750F from which the engine was originally derived the gear drive for the cams was moved from the centre of the engine in between the cylinders to the one side allowing a slightly narrower engine.

<span class="mw-page-title-main">Mondial Piega 1000</span> Italian sport motorbike

The Mondial Piega 1000 is an exotic, limited production Italian sport bike made by Mondial. The engine is from Honda, the same V-twin used on the VTR-1000 SP-1.

<span class="mw-page-title-main">Honda CBR125R</span> Sport bike

The Honda CBR125R is a CBR series 125 cc (7.6 cu in) single-cylinder sport bike made by Honda. The CBR125R first appeared on the market in 2004. It is manufactured in Thailand by A.P. Honda alongside the similarly designed CBR150R, which is primarily aimed for the Far East market.

<span class="mw-page-title-main">Honda VT250</span> Honda motorcycle

The VT250 or Spada MC20 is a Honda motorcycle built between late 1988 and the end of 1989.

<span class="mw-page-title-main">Honda CBR150R</span> Sport bike

The Honda CBR150R is a CBR series 150 cc (9.2 cu in) single-cylinder sport bike made by Honda. It is currently manufactured in Indonesia by Astra Honda Motor and previously in Thailand by A.P. Honda.

<span class="mw-page-title-main">Honda NX650 Dominator</span> Dual-sport motorcycle

The Honda NX650 Dominator is a dual-sport motorcycle. It was manufactured by Honda from 1988 to 2003.

The Suzuki LT250R was a sport ATV manufactured between 1985 and 1992. It combined a lightweight frame and good handling, with a 249cc liquid cooled two stroke engine.

<span class="mw-page-title-main">Kawasaki KR-1/KR-1S</span>

The Kawasaki KR-1 and KR-1S are road-orientated 249 cc (15.2 cu in) two-stroke sports bikes introduced between 1988 and 1992 by Kawasaki Heavy Industries.

<span class="mw-page-title-main">Kawasaki A1 Samurai</span> Type of motorcycle

The Kawasaki A1 Samurai is a 250 cc (15 cu in) standard class Kawasaki motorcycle which was sold from 1967 through 1971.

<span class="mw-page-title-main">Honda CB400SF</span> Japanese motorcycle

The Honda CB400 Super Four is a CB series 399 cc (24.3 cu in) standard motorcycle produced by Honda at the Kumamoto plant from 1992 to the present. The CB400 embodies the typical Universal Japanese Motorcycle produced through the 1970s, updated with modern technology. To this end, the bike has a naked retro design, paired with a smooth inline-four engine. Originally a Japan-only bike, it was later also available in SE Asia, and from 2008 in Australia.

The Ducati 239 Mark 3 is a 340 cc (21 cu in) single cylinder bevel drive SOHC motorcycle produced by the Italian manufacturer Ducati in limited quantities for the French market in 1974. The French Government has announced that they were to increase VAT on motorcycles of 240 cc and above in 1975. Ducati responded by producing the 239 to take advantage of the lower 20% VAT rate on sub-240 machines. To compensate for the reduced capacity, the engine was tuned to produce more power with a different camshaft, slipper piston, 30 mm carburettor and a different exhaust using a Lafranconi silencer.

References

  1. Ienatsch, Nick (January 8, 2018). "The Once-Banned 250cc Two-Stroke Sportbike Enters A New Haven Of Legend—Old Enough To Be Legal". Cycle World . Retrieved January 12, 2018.