Suzuki RM 125 - 2003 Specifications and Reviews

The 2003 Suzuki RM 125 is a lightweight motocross bike designed for junior riders and beginners entering competitive off-road racing. Known for its responsive single-cylinder two-stroke engine and nimble handling, it delivers excellent maneuverability and quick acceleration in technical terrain. The liquid-cooled power plant provides reliable performance while maintaining the low seat height and compact dimensions ideal for developing young riders.

4.5 stars Average rating: 4.5 from 2 votes
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General information

CategoryCross / motocross
Year2003
ModelSuzuki RM 125

Engine and Transmission Specifications

Transmission typefinal driveChain
Gearbox6-speed
Cooling systemLiquid
Fuel systemCarburettor
Bore x stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Compression8.9:1
Stroke2
Engine typeSingle cylinder
Capacity:124.00 ccm (7.57 cubic inches)
 
 

Physical measures and capacities

Wheelbase1,450 mm (57.1 inches)
Ground clearance350 mm (13.8 inches)
Overall width840 mm (33.1 inches)
Overall length2,145 mm (84.4 inches)
Seat height940 mm (37.0 inches) If adjustable, lowest setting.
Dry weight87.0 kg (191.8 pounds)

Suzuki RM 125 dimensions and frame

Rear brakesSingle disc
Front brakesSingle disc
Rear tyre dimensions100/90-19
Front tyre dimensions80/100-21
 
 

Speed and acceleration

Fuel capacity8.00 litres (2.11 gallons)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track85%
City5%
Cornering90%
Daily Riding5%
Touring5%
Passenger0%

Rider Profile

Best ForThis is a pure competition motocross bike best suited to experienced or intermediate off-road riders comfortable with a peaky two-stroke powerband.
PurposeBuilt exclusively for motocross track riding and racing, not for street or general recreational use.
Rider FitIts tall 950mm seat height, lightweight 87kg chassis, and aggressive ergonomics demand good rider fitness, strength, and off-road skill to manage standing and cornering loads.
CharacterA raw, high-revving two-stroke racer that rewards aggressive riding, precise clutch and throttle control, and active body positioning on the track.
Not Ideal ForThis is not suitable for commuting, touring, passengers, or casual road riders since it is unregistered, uncomfortable at low speed, and lacks lights or road equipment.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2003 Suzuki RM 125 Rider Ergonomics Assessment

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Feet:

At 940mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2003 Suzuki RM 125, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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