The NF4, which became a masterpiece machine, also changed its position from a chased person to a chased person due to its activity, and the basic design became a thing of the past with the passage of time. The winning percentage in GP125 was outstanding until the end, but in 1992 and 1994, Aprilia lost the rider champion.

Also, in 1994, Yamaha, which won the All Japan 125 Champion for the first time in 18 years in the previous year’s Works precedent activity, sent a new commercial road racer TZ to GP125, and the rise of rivals was remarkable.

For this reason, the 1995 RS125R = model NX4 was made a new machine that eliminated the CR-derived crankcase that had been used for a long time and adopted a completely exclusive engine and a greatly improved body.

In fact, the biggest issue with the RS125R of all time was the suppression of vibration. This was also the fate of being based on the crankcase of a motocrosser without a balancer, but the vibration was eliminated by installing a new balancer with a special engine design. At the same time, the opening area of ​​the reed valve, which was approaching the limit mainly in terms of durability, was also expanded.

The body that adopted the Prolink suspension for the first time in the RS125R will improve all the weak points of the NF4 ── Especially considering the dramatically increased number of users, conscious of “a wide range of responsiveness regardless of rider”, the body dimension that is easier to bend The goal was to achieve weight reduction.

As a successor to the NF4, the NX4 was released after an exceptionally early development and testing, with the determination that it would never lose to its rivals.

The opening round of 1995, the Japanese Grand Prix. Haruchika Aoki’s NX4 demonstrated overwhelming speed, pushing out Aprilia on which champion Kazuto Sakata rides and achieving Aoki’s first victory. The momentum did not stop during the season, and Aoki won the first rider title among Japanese RS users with a winning percentage of 13 races and 7 wins.

In 1996, Aoki became the champion, and during this time, Japanese riders such as Masaki Tokudome, Tomomi Manako, and Masao Azuma also won the GP for the first time.

As a result, in addition to users who switched from NF4, users who returned to RS125R from rival manufacturers’ machines also appeared, demonstrating support for RS. In terms of production volume, although we could not expect the four-digit number in Japan after the burst of the bubble, in Europe it has maintained the level of more than 100 units since NF4, and NX4 is the next generation RS125R = GP It was a success as a machine.

After that, the NX4 struggled with the existence of Aprilia, which has made remarkable progress, but in 1997 the fuel used was limited from Avgas to unleaded gasoline, and the development of the corresponding kit parts was delayed, so it was two years for Aprilia. Defeated in a row ── Substantial machine development in 2004, continued to run the top in GP125 until the end of kit parts development in 2005, born a total of 6 champions in 11 years, 5 times Won the maker champion.

Among them are riders such as Dani Pedrosa and Andrea Dovizioso who are active in the current MotoGP. Or Marco Melandri, Capirossi, who is still active in his rival team, and many other riders in MotoGP today have started their first steps with the RS125R.

Honda’s purpose is to aim for the top of the race pyramid with the champion at the top, and at the same time, it is Honda’s mission to develop the riders and environment at the bottom. Since its birth, the RS125R has been a machine that the development team, who loves motorcycles and racing, has been passionate about as a “cradle for riders who dream of being a champion”.

It can be said that this gave a big dream and significance to this machine, which is a very small entry-class commercial racer. Honda is proud that no commercial road racer has realized as many battles and dreams as the RS, supported by privateers around the world.

Also, I am keenly aware that the culture of motorcycles that transcends genres such as commercial vehicles for public roads and racers can only be born from manufacturing with an eye on the essence and continuous efforts.

(Sentence, Morimasa Sekiya)

 

 

NX4 Specifications

SPECIFICATION
MODELRS125R
TYPEJR01
LENGTH × WIDTH × HEIGHT1800mm × 570mm × 995mm
WHEELBASE1215mm
GROUND CLEARANCE110mm
SEAT HEIGHT700mm
CASTER ANGLE23°30’
WEIGHT (SEMI DRY)71.5kg
ENGINE TYPELIQUID COOLED TWO STROKE SINGLE
DISPLACEMENT124cc
BORE AND STROKE54mm x 54.5mm
MAX POWER32.3 / 12250 (kw/RPM) [44/12250] (ps/RPM)
MAX TORQUE24.5 / 12255 (Nm/RPM) [2.5 / 12250] (kgf•m/RPM)
CARBURETORKEIHIN PJ35 (TH SENSOR&PWJ)
IGNITIONDIGITAL CDI
TRANSMISSION6 SPEED
CLUTCHWET MULTI PLATE
FUEL TANK CAPACITY14 LITER
ENGINE OIL CAPACITY0.5 LITER
FLAME TYPEALLUMINUM TWIN TUBE
BRAKEFRONT : 296mm SINGLE DISK REAR : 186mm SINGLE DISK
WHEELFRONT : 2.50-17 REAR : 3.50-17
SUSPENSIONFRONT : INVERTED TELESCOPIC FORK REAR : SWINGARM

Year: 2002

Make: HONDA

Model: RS125R

2002 RS125R
 
RS125R_02•Liquid-cooled 2-stroke crankcase reed valve single-cylinder engine with primary balancer •High-output inner rotor ACG •Transmission holder facilitates gear changes while engine is mounted •Aluminum twin-spar frame features superb balance of light weight and high rigidity •35mm Showa inverted front fork •Aluminum swing arm with Pro-link suspension •Power full and controllable Special-made Brembo 4-piston caliper front disc brake •highly aerodynamic cowling and fuel tank

Improved stability and cornering ability by changing the front and rear suspensions.
RS125RThe RS125R's performance has been innovated to a new dimension in order to win and set new records. This machine provides outstanding stability and is excellent at absorbing gaps in high-speed cornering situations because of its advanced features such as front suspension dampers and adopting a new layered damper for the damper valves. The specifications of the damper valves in the rear suspension have been changed. By improving the stability during both entering and returning to its vertical position when coming out of the corner and balance when accelerating, the RS125R has been able to improve its cornering ability. The RS125R's improved features make it strong yet sleek, giving the rider a completely new experience.

Enhanced durability throughout, including the power unit.
RS125RThe piston ring, clutch rings, lead dampers and drive chain have all been changed. The shape of the sleeve has been changed to reduce the impact during cylinder port transit. Clutch transmission has been enhanced through an increase in the clutch spring load. The lead damper format has been modified. Twisting and resonance in the lead valve have been reduced, and both performance and durability have been improved. A sealed-type drive chain is also equiped. These changes all contribute to improved durability. Maintenance is also easier, thanks to the replacement of the screw-in clutch cable assembly with a plug-in type, which can be removed without tools. The front and rear wheels have both been colored black, in keeping with the bold image of this prestigious machine.

Superior aerodynamic performance and protection by adopting new cowling structure.
RS125RThe shape of the cowling has been completely changed. The front cowling was changed to a large-sized, knuckle-shaped format, and the upper cowling was also enlarged. The lower cowling was made thinner, and at the same time, the back end was extended. This will help to stabilize the machine in the turbulence that occurs from the rider’s arms to shoulders and will provide maximum protection. A major improvement has been realized in aerodynamic performance. The rider’s wind resistance at high speeds has also been reduced. This will enable riders to maintain concentration and lead to a higher level of riding during extreme competitive racing.
2002 RS125 SPECIFICATIONS
ModelRS125R
Model No.JR01
Dimensions (LxWxH)1,800 x 570 x 985
Wheelbase1,215
Ground Clearance110
Seat Height700
Caster Angle23° 30'
Half Dry Weight71kg
EngineLiquid-cooled forward -inclined 2-stroke crankcase reed valve single
Displacement124cm3
BorexStroke54 x 54.5
Max. Power Output32.3kw/12,250rpm
44ps/12,250rpm (unleaded high-octane fuel)
Max. Torque24.5N•m/12,000rpm
2.5kgf-m/12,250rpm (unleaded high-octane fuel)
CarburetorKeihin PJ38 throttle sensor-equipped power jet control
IgnitionDigital CDI
Transmission6-speed
ClutchWet multiplate
Fuel Capacity14 liters
Oil Capacity0.5 liters
FrameAluminum twin-spar
Brakesø296mm single floating disk with 4-piston caliper
ø186mm single disk with single-piston piston caliper
WheelsFR 2.50-17 6-spoke ‘U’ -section cast aluminum
RR 3.50-17 6-spoke ‘U’ -section cast aluminum
SuspensionFR Fully adjustable 35mm inverted telescopic fork
RR Remote reservoir damper
 
Included Parts
Part NameQty.
Oner's manual/Parts list1
Carburetor setting kit1
Baffle sponge (for fuel tank filler)4
Drive sprocket (15t)1
Drive sprocket (17t)1
Final driven sprocket (36t)1
Final driven sprocket (37t)1
Main stand1
Step stand1
Rubber seat pad1
Rubber seat back pad1
Self-locking band2
 
Set-Up Kit
Part NameQtr.
Left cover O-ring1
Right cover gasket3
Cylinder1
Cylinder gasket (0.5)5
Cylinder head1
O-ring (96x2.4mm)2
O-ring (61x1.9mm)5
Crankshaft1
Piston3
Piston wrist pin3
Piston pin clip (15mm)20
Piston ring3
Reed valve4
Reed valve gasket4
Exhaust joint gasket8
Exhaust pipe seal8
Exhaust pipe spring2
Water pump gasket2
Clutch friction disk7
Clutch plate6
Spark plug (R6385-105P)1
Sealing washer (8mm)5
Radial ball bearing (6305SPL)2
Connecting rod small-end bearing3
Oil seal (32x48x8mm)1
Special O-ring1
Stud bolt (8x32mm)5
Dowel pin (6x10mm)2
Rear wheel damper rubber3
Front brake pad2
Wing mark (stacker)R/1 L/1

Year: 1998

Make: HONDA

Model: RS125R

1998 RS125
Item
Specification
DimensionsOverall length1,800 mm (70.9 in)
Overall width570 mm (22.4 in)
Overall height985 mm (38.8 in)
Wheelbase1,215 mm (47.8 in)
Ground clearance110 mm (4.3 in)
Seat height700 mm (27.6 in)
Half dry weight71 kg (156 lbs)
FrameTypeAluminum twin tube
Front suspensionTelescopic, inverted type
Rear suspensionSwingarm, Pro-link
Front brakeSingle disc / 4 piston caliper
Rear brakeSingle disc / 1 piston caliper
Fuel capacity13.0 liter (3.4 US gal)
Caster angle23 ° 30'
Trail length84mm (3.3 in)
EngineTypeLiquid cooled, 2-stroke
CylinderSingle cylinder, inclined 40 ° from vertical
Bore & stroke54 x 54.5 mm (2.12 x 2.15 in)
Displacement124 cm3 (7.6 cu-in)
Drive trainClutch typeMulti plate wet
Transmission6-speed, constant mesh
Gearshift patternLeft foot operated return system
1 - N - 2 - 3 - 4 - 5 - 6
Primary reduction2.952 (62/21)
Gear ratios
1st1.875 (30/16)
2nd1.524 (32/21)
3rd1.304 (30/23)
4th1.167 (28/24)
5th1.077 (28/26)
6th1.000 (24/24)
Final reduction2.250 (36/16)
ElectricalIgnition systemDigital advanced CDI
Ignition timing24.5 ° BTDC @ 6,000 rpm
1997 Honda RS125 Specifications
1997 RS125
Item
Specification
DimensionsOverall length1,800 mm (70.9 in)
Overall width570 mm (22.4 in)
Overall height985 mm (38.8 in)
Wheelbase1,215 mm (47.8 in)
Ground clearance110 mm (4.3 in)
Seat height700 mm (27.6 in)
Half dry weight71 kg (156 lbs)
FrameTypeAluminum twin tube
Front suspensionTelescopic, inverted type
Rear suspensionSwingarm, Pro-link
Front brakeSingle disc / 4 piston caliper
Rear brakeSingle disc / 1 piston caliper
Fuel capacity13.0 liter (3.4 US gal)
Caster angle23 ° 30'
Trail length84mm (3.3 in)
EngineTypeLiquid cooled, 2-stroke
CylinderSingle cylinder, inclined 40 ° from vertical
Bore & stroke54 x 54.5 mm (2.12 x 2.15 in)
Displacement124 cm3 (7.6 cu-in)
Drive trainClutch typeMulti plate wet
Transmission6-speed, constant mesh
Gearshift patternLeft foot operated return system
1 - N - 2 - 3 - 4 - 5 - 6
Primary reduction2.952 (62/21)
Gear ratios
1st1.875 (30/16)
2nd1.524 (32/21)
3rd1.304 (30/23)
4th1.167 (28/24)
5th1.077 (28/26)
6th1.000 (24/24)
Final reduction2.250 (36/16)
ElectricalIgnition systemDigital advanced CDI
Ignition timing24.5 ° BTDC @ 6,000 rpm