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1981 | RM125

Fully equipped with the latest technologies including a liquid-cooled engine and the Full Floater suspension

RM125

The RM125 is equipped with a liquid-cooled engine developed through direct feedback from technologies adopted on factory motocrossers. This is Suzuki’s first liquid-cooled engine for a motocross model. A power reed valve was adopted for the intake system to deliver stable torque from low- to high-rpm ranges. It also features the Full Floater suspension that was introduced to Suzuki’s championship-winning factory motocross racers in the second half of the previous season, and helps to realize superb road holding performance.

Dimensions and weight Dimensions Overall length 2,125 mm
Overall width 835 mm
Overall height 1,200 mm
Wheelbase 1,440 mm
Weight 88 kg
Engine Engine type 2-stroke, 1-cylinder, air-cooled
Engine displacement 123 cm³
Bore x stroke 54.0 mm × 54.0 mm
Maximum power 22.4kW(30.5PS) / 10,500rpm
Maximum torque 20.4N-m / 9,750rpm
Transmission 6-speed constant mesh
Front tire size 3.00-21-4PR
Rear tire size 4.10-18-4PR

1989 | RM125

New adoption of a crankcase reed valve with a proven race record

RM125

This model adopts a new crankcase reed valve type engine, a technology that was directly passed down from factory motocrossers. This valve realizes high filling efficiency across a wide range of engine speeds, improved cooling and lubrication of engine parts, and substantially higher reliability. In addition, the bore × stroke dimensions were changed from 54 × 54 mm to 54 × 54.5 mm. Maximum horsepower was increased from 35.5 to 36 PS.

Dimensions and weight Dimensions Overall length 2,145 mm
Overall width 815 mm
Overall height 1,250 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 26.5kW(36PS) / 11,000rpm
Maximum torque 23.7N-m / 9,000rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21-51M
Rear tire size 100/100-18-59M

1993 | RM125

Further enhancing the overwhelming high-performance inherited from the factory racing machine

RM125

The competitiveness of the crankcase reed valve type engine was enhanced even further by measures such as increasing the primary compression ratio, widening the main and third exhaust ports, and changing the exhaust valves, resulting in substantially higher power characteristics. The semi-double cradle frame, which incorporates a high proportion of large-diameter angular-cross-section chromium molybdenum steel tubes, was newly designed with the same structure as the RM250 at the rear, further enhancing the balance between lightness, strength, and rigidity.

Dimensions and weight Dimensions Overall length 2,130 mm
Overall width 815 mm
Overall height 1,250 mm
Wheelbase 1,435 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 29.1kW(39.5PS) / 11,000rpm
Maximum torque 26.5N-m / 10,000rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21-51M
Rear tire size 100/90-19-57M

1996 | RM125

Latest model change featuring more powerful engine at low to middle revs and new front and rear suspensions

RM125

With this model change, the RM125 features new ellipsoid Automatic Exhaust Timing Control (AETC) valves, which deliver even easier-to-handle power characteristics in the low rpm range. Modified port timing also enhances torque characteristics at low to middle revs. The newly designed frame features an advanced semi-double cradle structure with a better rigidity balance due to the adoption of a rounded pipe for the main tube. In addition, the use of a detachable aluminum subframe enhances the ease of maintenance and reduces the weight around the rear of the bike. Maintenance was also made substantially easier by the adoption of newly developed upright twin-chamber cartridge front forks and a completely redesigned new link-type rear suspension.

Dimensions and weight Dimensions Overall length 2,140 mm
Overall width 815 mm
Overall height 1,250 mm
Wheelbase 1,445 mm
Weight 87.5 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 29.1kW(39.5PS) / 11,500rpm
Maximum torque 25.5N-m / 10,500rpm
Transmission 6-speed constant mesh
Front tire size 80/100-21-51M
Rear tire size 100/90-19-57M

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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