October 29, 1985, Press Release: Honda releases the road sports bike "HONDA MBX50F" equipped with a water-cooled, two-stroke engine

Honda Motor Co., Ltd. has increased the power output of the Honda MBX50 (from 5.6PS/6500rpm to 7.2PS/8500rpm) and redesigned its color scheme to make it a versatile 50cc road sports bike that can be used for everything from entry-level models to general road touring. The new bike will go on sale on November 1st as the Honda MBX50F.

The engine installed in this MBX50F adopts a four-leaf reed valve with a straightening plate that brings smooth intake to the inlet port (intake hole) , a hemispherical combustion chamber with excellent combustion efficiency, and a large exhaust chamber that enables powerful torque characteristics from low to medium speeds.

The transmission adopts a 6-speed transmission that allows a wide range of appropriate gears to be selected depending on the riding conditions.

The body design has a body size (wheelbase: 1255mm) that allows a relaxed riding posture, and the frame adopts a lightweight, high-rigidity semi-double cradle frame.

The rear suspension is a Pro-Link type that is well-received for its excellent road following performance, and the front wheel brake adopts Honda's original hydraulic disc brake with dual piston caliper. In terms of equipment, the coloring has been renewed, and the appearance of a cowl and under cowl has been added to give it a bold image, and the lightweight boomerang-shaped aluminum Comstar wheels are adopted for the front and rear wheels, making it a fully equipped road sports bike.

*The reed valve is a tongue-shaped valve in the crankcase mixture intake port that opens and closes automatically due to the difference in air pressure. By using a four-leaf type with two straightening vanes on the top and bottom, the flow rate of the mixture is increased, improving intake efficiency.

Sales Plan (Domestic Annual Plan)

15,000 units

National Standard Cash Price

198,000 yen
(Prices for Hokkaido and Okinawa are 5,000 yen higher. Prices exclude some other remote islands.)

Specifications

Model A-AC08
Total length (m) 1.920
Overall width(m) 0.675
Total height (m) 1.105
Wheelbase(m) 1.255
Minimum ground clearance(m) 0.170
Seat height(m) 0.770
Vehicle weight (kg) 94
Dry weight (kg) 82
Passenger capacity (persons) 1
Fuel economy (km/L) 65 (30km/h steady state test value)
Minimum turning radius (m) 2.0
Engine type AC08E (water-cooled 2-stroke single cylinder)
Total displacement (cm 3 ) 49
Inner diameter x stroke (mm) 39.0×41.4
Compression Ratio 7.3
Maximum power (PS/rpm) 7.2/8,500
Maximum torque (kg-m/rpm) 0.65/7,500
Carburetor Type PF16
Starting method Kick Type
Ignition method CDI type magnet ignition
Lubrication Method Separate lubrication type
Lubricating oil capacity (L) 1.2
Fuel tank capacity(L) 11
Clutch type Wet type multi-plate coil spring
Transmission type Constant mesh 6-speed return
Gear ratio 1st gear 3.545, 2nd speed 2.333, 3rd speed 1.722, 4-speed 1.380, 5-speed 1.173, 6-speed 1.041
Reduction ratio primary/secondary 4.117/3.071
Caster (degrees) 26°30′
Trail (mm) 72
Tire size Front 2.50-18-4PR | Rear 2.75-18-4PR
Brake Type Front Hydraulic disc | Rear Mechanical Leading Trailing
Suspension Front Telescopic | Rear Swing arm (Prolink)
Frame Format Semi-double cradle

April 20, 1984, Press Release, Honda releases the road sports bike "Honda MBX50" equipped with a water-cooled, two-stroke engine

Honda Motor Co., Ltd. will release the Honda MBX50, a road sports bike equipped with a water-cooled, two-stroke, single-cylinder (total displacement: 49 cm3 ) engine, on April 21st, which can be used for a wide range of purposes, from entry-level models to general road touring.

The engine installed in this MBX50 adopts a four-leaf reed valve with a straightening plate that provides smooth intake to the inlet port, a hemispherical combustion chamber with excellent combustion efficiency, and a large exhaust chamber, which together provide powerful torque characteristics from low to medium speeds.

The body design adopts a body size (wheelbase: 1260mm) that allows for a relaxed riding posture. The frame is a lightweight, high-rigidity semi-double cradle frame. The rear suspension is a Pro-Link type that is well-received for its excellent road-following ability, and the front wheel brake is a hydraulic disc brake with Honda's unique dual piston caliper. In addition, the front and rear wheels are equipped with lightweight boomerang-shaped all-aluminum Sports Comstars, making it a fully equipped road sports bike.
Honda's 50cc class sports bikes now include the MTX50R land sports bike, the TLM50 trekking bike, and the MBX50, and are able to meet the needs of a wide range of customers, from on-road to off-road.

Sales plan (domestic/annual)

10,000 units (planned)

National Standard Cash Price

189,000 yen
(Prices for Hokkaido and Okinawa are 5,000 yen higher. Other, some remote islands are excluded.)

Other key features

○Sporty under-cowl is standard equipment.

○Translucent speedometer and tachometer are used.

○Equipped with a large-capacity (12V3AH) small battery.

Specifications

Model A-AC08
Total length (m) 1.920
Overall width(m) 0.675
Total height (m) 1.000
Wheelbase(m) 1.260
Minimum ground clearance(m) 0.165
Seat height(m) 0.770
Vehicle weight (kg) 93
Dry weight (kg) 81
Passenger capacity (persons) 1
Fuel economy (km/L) 65 (30km/h steady state test value)
Climbing ability (tanθ) 0.46 (approx. 25 degrees)
Minimum turning radius (m) 2.0
Engine type AC08E (water-cooled 2-stroke single cylinder)
Total displacement (cm 3 ) 49
Inner diameter x stroke (mm) 39.0×41.4
Compression Ratio 7.3
Maximum power (PS/rpm) 5.6/6,500
Maximum torque (kg-m/rpm) 0.63/6,000
Carburetor Type PF11
Starting method Primary Kick
Ignition method CDI type magnet ignition
Lubrication Method Separate lubrication type
Lubricating oil capacity (L) 1.2
Fuel tank capacity(L) 12
Clutch type Wet type multi-plate coil spring
Transmission type Constant mesh type 5-stage return
Gear ratios, 1st gear 3.083, 2nd speed 1.882, 3rd speed 1.400, 4-speed 1.130, 5-speed 1.000
Reduction ratio primary/secondary 4.117/3.615
Caster (degrees) 26°30′
Trail (mm) 72
Tire size front 2.50-18-4PR | rear 2.75-18-4PR
Brake Type Front Hydraulic disc | Rear Mechanical Leading Trailing
Suspension method Front Telescopic | Rear Swing arm (Prolink)
Frame Format Semi-double cradle

February 25, 1982, Press Release, Honda releases MBX50, a road sports bike with authentic class and texture

 Honda Motor Co., Ltd. will release the Honda MBX50 on March 1st. The new bike has the class and feel of a true road sports bike, and offers a relaxed ride.

The MBX50 has a long wheelbase design (1255mm) that allows for a comfortable ride in a relaxed riding position that reduces fatigue not only in city driving but also in long-distance touring.

In addition, the large 12L fuel tank, front fender with air guide, turn signals integrated with the rear cowl, tail lamp, etc. further emphasize the bike's status as a full-fledged sports bike.

The engine is a newly designed water-cooled two-stroke 49cc engine that uses technologies such as Honda's unique four-leaf reed valve with a straightening plate, which improves ease of use in the low and medium speed ranges. It has excellent fuel economy (73.0km/L, 30km/h constant speed test value), and coupled with the large fuel tank, it makes long-distance touring enjoyable.

In addition, the body uses a high-rigidity semi-double cradle frame using ultra-high tensile steel around the head pipe, and has a lightweight design (dry weight 79kg) that is easy to handle.

The rear suspension is a Pro-Link type that has already been adopted in high-end sports cars and has been highly praised. This, combined with the large diameter 29φ front forks and lightweight aluminum boomerang-shaped Sports Comstar wheels, provides excellent manoeuvrability and ride comfort.

The front brakes use Honda's unique dual piston calipers, providing excellent braking performance.

In addition, the bike is fully equipped with a 12-volt, 3-amp battery, a large rectangular headlamp (35 watts), and a highly visible translucent meter with illuminated needles.

The sales plan is

The planned production volume is 12,000 units per year.

Standard cash price is

186,000 yen

(Prices in Hokkaido and Okinawa are 3,000 yen higher, excluding some remote islands. )

MBX50 Main Specifications

Total length (m) 1.920
Overall width (m) 0.675
Height (m) 1.000
Wheelbase (m) 1.255
Dry weight (kg) 79
Seat height (mm) 770
Frame Format Semi-double cradle
Tire size (front) 2.50-18-4PR | (rear) 2.75-18-4PR
Engine type AC03E 2-stroke single cylinder
Cooling Method Water Cooling
Caster/Trail (m/m) 26°30′/72
Total displacement (cm 3 ) 49
Inner diameter x stroke (mm) 39.0×41.4
Maximum power (PS/rpm) 7.2/8,500
Maximum torque (kg-m/rpm) 0.65/7,500
Compression Ratio 7.3
Starting method Kick Type
Ignition method CDI with 2-stage retard
Fuel tank capacity (L) 12.0
Transmission type 6-speed return
Gear ratios, 1st gear 3.545, 2nd speed 2.333, 3rd speed 1.722, 4-speed 1.380, 5-speed 1.173, 6-speed 1.041
Shock absorber, Front Telescopic | (rear) Pro Link
Carburetor PF15
Battery YB3L 12V-3AH

Press Release, January 20, 1989 - Honda releases two types of road sports bike "Honda NS50F" with dual headlights

Honda Motor Co., Ltd. will release an even more fearless version of the Honda NS50F, a popular road sports bike with a large body and full-fledged equipment despite being 50cc, with dual headlights that give it an even more aggressive look and a new color scheme from February 15, 1989, and a Rothmans color specification (limited edition) from January 21 of the same year.

The new NS50F engine is a water-cooled, two-stroke, single-cylinder engine that is easy to handle from low and mid-range to high-range and has a powerful output characteristic (7.2PS/10,000rpm). The half fairing equipped on the large frame body is newly equipped with a lens-integrated dual headlight (pale yellow krypton bulb, 18W/18W x 2). In addition to the basic design suitable for long-distance touring, it has also improved usability for night driving.

The coloring design is set to two colors: "Red & White" inspired by HRC racers and "Dark Blue Metallic" color of the Seed Racing Team. At the same time, "Blue & White" color of the Rothmans Honda team is set as a limited coloring model, further enhancing the authentic sports mood.

Sales plan (domestic/annual)
20,000 units (including 4,000 limited editions)

National Standard Cash Price
225,000 yen

(Excluding Hokkaido and Okinawa, which are 5,000 yen higher, and some other remote islands.)

Specifications 

Model A-AC08
Overall length x overall width x overall height (m) 1.855×0.630×1.065
Wheelbase(m) 1.260
Minimum ground clearance(m) 0.170
Seat height(m) 0.760
Vehicle weight/dry weight (kg) 92/79
Passenger capacity (persons) 1
Fuel economy (km/L) 50km/h constant speed test value 61.5
Minimum turning radius (m) 2.4
Engine type AC08E (water-cooled 2-stroke single cylinder)
Total displacement (cm 3 ) 49
Inner diameter x stroke (mm) 39.0×41.4
Compression Ratio 7.2
Maximum power (PS/rpm) 7.2/10,000
Maximum torque (kg-m/rpm) 0.65/7,500
Carburettor Type PF70
Starting method Kick Type
Ignition type CDI type magnet ignition
Lubrication Method Separate lubrication type
Lubricating oil capacity (L) 1.2
Fuel tank capacity(L) 10.0
Clutch type Wet type multi-plate coil spring
Transmission type Constant mesh 6-speed return
Gear ratios: 1st gear 3.545 | 2nd speed 2.333 | 3rd speed 1.722 | 4-speed 1.380 | 5-speed 1.173 | 6-speed 1.041
Reduction ratio (primary/secondary) 4.117/2.928
Caster(degrees)/Trail(mm) 25°30′/70
Tire size Front 2.75-17-4PR | Rear 3.00-17-4PR
Brake Type Front Hydraulic disc | Rear Mechanical Leading/Trailing
Suspension method Front Telescopic Type | Rear Swing arm type
Frame Format Semi-double cradle