Honda NSR125

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Honda NSR125
Manufacturer Honda
Production 1988-2001
Successor Honda CBR125R
Related Honda NSR150

The Honda NSR125 is a 2 stroke, 125 cc (lightweight) sport bike produced between 1988-2001. The high revving (red zone of the tachometer begins at 11,000 rpm), 2 stroke single cylinder engine produced around 30 bhp (22 kW) at the crank. The name is taken from the NSR 500 GP bike which proved great success on the track.

Contents

[edit] History and Development

While the NSR125 is mostly of Japanese manufacture, with the engine parts and other key elements of the running of the motorbike produced in Japan, It was then assembled in Italy and supplied to its mainly European market.

There were 2 models of the bike; the earlier model (more correctly, an NS125R) with a "square" headlight, produced between 1988-1994 and the later "fox eye" model (named due to its front lights resembling that of a fox)produced between 1994-2001. Whilst drastic changes were made to the aesthetics of the motorbike very little was changed on mechanical or engineering side.

Eventually however, new stricter regulations in the EU began phasing out the 2 stroke motorcycles and the NSR125 ceased production in 2001.

Although it is a common mistake to believe the NSR continued production until 2003. This is not the case as they ceased production in 2001 but had leftover stock until 2003/4.

[edit] Model Regional Differences

There is a large problem with de-restricting certain models of the NSR 125 and this is mainly dependant on where the bike was manufactured for. To tell the difference you must check your frame number.

[edit] Italy

This has the frame number ZDCJC22A******

This is a full power bike and has no restrictions.

[edit] UK

This has the frame number ZDCJC22C******

The restrictions on this bike are in the exhaust which must be drilled and filed out and a metal plate in the intake manifold which must be taken out.

Once both these things have been completed you must upjet the standard carburettor from 135 main, 65 power, 42 idle to a 138 main and you may leave the rest alone.

[edit] France

This has the frame number ZDCJC22B******

This is heavily restricted in both the exhaust, intake and also electrical restrictions. The exhaust restriction is about 8 inches in the exhaust and will require it to be cut open, removed and re-welded. A simple solution would be to by a full power exhaust or a race exhaust.

The intake restriction is the same as all the others.

The electrical restrictions are in the CDI and come with a CI639 and TV-124. To fix this you will need to obtain the full power units CI626 and TV-78 from a UK or Italian spec bike.

Once this is completed you must change the jetting from the standard. 132main, 60 power and 40 idle to 138main, 65 power and 42 idle.

[edit] Switzerland

This has the frame number ZDCJC22E******

This has a load of restrictions and is nearly impossible to derestrict and cannot even rev past 7500 rpm.

[edit] Specifications

Specifications for the Honda NSR125 that are manufacture claimed or estimated.

Engine and Transmission

- Displacement: 124.00 cc

- Engine type: Single cylinder

- Stroke: 2

- Torque: 1,98 Kpm/9000 rpm (unrestricted)

- Power: 31 hp/10250 rpm (unrestricted)

- Bore x stroke: 54.0 x 54.5 mm

- Gearbox: 6-speed

- Transmission type final drive: Chain

- Tank volume: 13 litres (incl. reserve)

Physical Measures

- Dry weight: 132.0 kg

- Seat height: 800 mm

- Overall length: 2,075 mm

- Overall width: 670 mm

Chassis and Dimensions

- Chassis: Aluminium

- Front tyre dimensions: 100/80-17

- Rear tyre dimensions: 130/70-17

- Front brakes: Single disc with 2 pot Grimeca callipers

- Rear brakes: Single disc with 2 pot Grimeca callipers

Speed and Acceleration

- 0-100 km/h (secs): unrestricted - 6.0; restricted - 9.0

- Top speed (km/h): unrestricted - 170; restricted - 130

- Power/weight ratio: 0.1136 hp/kg

[edit] External links

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Honda Motorcycles, 2000s
Type 2000s
0 1 2 3 4 5 6 7 8 9
Standard CB600F/Hornet/599
CB900F/Hornet/919 CB1000R
Sport NSR125 CBR125R
CBR600F4 CBR600F4i
CBR600RR
CBR929RR CBR954RR CBR1000RR
RC51
VTR1000F
CBR1100XX (North American sales ended 2003)
VFR800 Interceptor