Monday, 10 November 2025

October 29, 1982, Press Release, Honda releases new off-road model "Honda MTX125R" equipped with a water-cooled 2-stroke engine

Honda Motor Co., Ltd. will release the off-road model "Honda MTX125R" on November 15th. The new model is equipped with a newly designed water-cooled, two-stroke, 124cc single-cylinder engine that incorporates know-how gained from motocross races both in Japan and overseas, as well as Honda's unique ATAC (Automatic Adjusting Torque Amplification Exhaust System)




The MTX125R has a high power performance of 18PS/7500rpm, 145hp per liter, and the revolutionary ATAC system automatically changes the exhaust volume according to the engine speed, giving it power at high speeds and a flat torque characteristic at low speeds, which is hard to believe for a two-stroke engine. This allows for smooth riding from low to high speeds. 

The powerful form of the bike, which has the image of a motocrosser, is also lightweight (99kg dry weight) and compact, with a power-to-weight ratio of 5.5kg per horsepower, giving it a powerful ride. It also features a Pro-Link rear suspension, which is popular for its excellent road-following ability, a front air-assisted suspension with Honda's unique fork mechanism, and a 6-speed transmission with a wide gear ratio. While ensuring a road clearance of 285mm, the bike's slim body makes it easy for the rider to reach the ground, and its large seat is designed to provide a free riding position, giving it excellent off-road performance and allowing the rider to enjoy a variety of sporty riding styles, from driving in urban areas to forest road touring.

The sales plan is

The plan is to sell 12,000 units per year in Japan.

Standard cash price is

249,000 yen
(Prices for Hokkaido and Okinawa are 5,000 yen higher, excluding some remote islands)

Other key features

●The engine is a water-cooled, two-stroke, single-cylinder, 124cc engine that is powerful yet easy to handle, with a maximum output of 18PS/7500rpm and a maximum torque of 1.7kg-m/7000rpm.

●The radiator is positioned to prevent dirt from getting in from below. It is a lightweight, highly efficient radiator system made of single-core aluminum.

●Square cross-section hollow rear fork made of lightweight, high-rigidity high-tensile steel tubes.

●Large front fender with air intake to improve the radiator's cooling effect.

●Adoption of a foldable shift and brake pedal.

●A fearless meter visor that protects the meter from dirt, sand, etc.

●The speedometer and tachometer are set at an easy-to-read angle, and various indicators are functionally laid out.

●Halogen headlights (35/36.5W) that are effective for night driving.

●The rear fender is reminiscent of a motocross bike, with the taillight set lower.

●The lever uses a newly designed dog-leg type that improves operability.

●Uses a compact 12V, 3A battery.

Main specifications

Model JD05

Total length (m) 2.085

Overall width(m) 0.830

Total height (m) 1.175

Wheelbase(m) 1.350

Minimum ground clearance(m) 0.285

Seat height(m) 0.845

Vehicle weight (kg) 109

Dry weight (kg) 99

Passenger capacity (persons) 2

Fuel economy (km/L) 55 (50km/h steady state test value)

Climbing ability (tanθ) 0.40 (approx. 22 degrees)

Minimum turning radius (m) 2.0

Engine type JD05E, water-cooled 2-stroke, piston reed valve, single cylinder

Displacement ( cm3 ) 124

Inner diameter x stroke (mm) 56.0×50.6

Compression Ratio 7.5

Maximum power output (PS/rpm) 18/7,500

Maximum torque (kg-m/rpm) 1.7/7,000

Carburetor Type PE60

Starting method Primary Kick

Ignition method Non-contact CDI

Lubrication Method Separate lubrication type

Lubricating oil capacity (L) 1.8

Fuel tank capacity(L) 9.0

Clutch type Wet type multi-plate coil spring

Transmission type Constant mesh 6-speed return

Gear ratio 1st gear 3.090

2nd speed 2.000

3rd speed 1.473

4-speed 1.136

5-speed 0.958

6-speed 0.807

Caster (degrees) 27°30′

Trail (mm) 112

Tire size before 2.75-21-4PR

rear 4.10-18-4PR

Brake Type before Mechanical Leading Trailing

rear Mechanical Leading Trailing

Suspension method before Telescopic

rear Swing arm (Prolink)

Frame Format Semi-double cradle

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