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1998 | RM125

A newly designed engine for enhanced performance

RM125

Installing the water pump inside the crankcase streamlines the area around the engine, reducing the amount of mud that sticks to the bike during riding, and making it easier to maintain. The shape and timing of the ports, the expansion chamber, and exhaust valves were all re-designed to reflect the latest technological advances, increasing power and torque at all rpm ranges. The rear suspension features an updated link structure and brand new swingarm that create more progressive characteristics, helping to improve shock absorption and road handling even on rough terrain.

Dimensions and weight Dimensions Overall length 2,150 mm
Overall width 815 mm
Overall height 1,250 mm
Wheelbase 1,455 mm
Weight 88 kg
Engine Engine type 2-stroke, 1-cylinder, liquid-cooled
Engine displacement 124 cm³
Bore x stroke 54.0 mm × 54.5 mm
Maximum power 29.4kW(40PS) / 11,500rpm
Maximum torque 26.5N-m / 10,500rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21-51M
Rear tire size 100/90-19-57M

2001 | RM125

Full model change with new engine, frame, and exterior plastic parts

RM125

Similar to the RM250, the engine and chassis of the RM125 were almost completely redesigned to realize a sweeping reduction in weight, higher power, and greater torque. The result is a bike that creates a superb balance between road handling and controllability. The newly designed engine features a straight intake passage, modified scavenging port timing, and new exhaust pipe dimensions, which help to generate higher power in the mid- to high-rpm range. The weight of the engine was also reduced by 750 g, and its length shortened by 21 mm. While retaining the semi-double cradle frame of the previous model, the specifications and design, including the rigidity balance, weight distribution, swingarm, suspensions, and geometry, were all completely updated. The result is an ideal motocrosser that creates a winning balance with its new high-performance engine.

Dimensions and weight Dimensions Overall length 2,145 mm
Overall width 840 mm
Overall height 1,275 mm
Wheelbase 1,470 mm
Weight 86.5 kg
Engine Engine type 2-stroke, 1-cylinder, liquid-cooled
Engine displacement 124 cm³
Bore x stroke 54.0 mm × 54.5 mm
Maximum power 30.2kW(41PS) / 11,500rpm
Maximum torque 27.1N-m / 10,500rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21-51M
Rear tire size 100/90-19-57M

2004 | RM125

Completely new exhaust valve layout

RM125

This full model change of the RM125 pairs a completely new exhaust valve drive system with a triple exhaust port layout that includes a sub-port in place of the dual split exhaust ports of the previous model. This combination enhances engine response at low speeds, as well as traction at medium and high speeds.

Dimensions and weight Dimensions Overall length 2,145 mm
Overall width 840 mm
Overall height 1,275 mm
Wheelbase 1,450 mm
Weight 87 kg
Engine Engine type 2-stroke, 1-cylinder, liquid-cooled
Engine displacement 124 cm³
Bore x stroke 54.0 mm × 54.5 mm
Maximum power 30.2kW(41PS) / 11,500rpm
Maximum torque 27.1N-m / 10,500rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21M/C 51M
Rear tire size 100/90-19M/C 57M
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