What category is the 2003 KTM 125 SX?

The 2003 KTM 125 SX has a Category of Cross / motocross.

What is the engine size of the 2003 KTM 125 SX?

The 2003 KTM 125 SX has a Capacity: of 124.80 ccm (7.62 cubic inches).

What type of engine does the 2003 KTM 125 SX have?

The 2003 KTM 125 SX has a Engine type of Single cylinder.

Is the 2003 KTM 125 SX air cooled or liquid cooled?

The 2003 KTM 125 SX has a Cooling system of Liquid.

How many gears does the 2003 KTM 125 SX have?

The 2003 KTM 125 SX has a Gearbox of 5-speed.

How much does the 2003 KTM 125 SX weigh?

The 2003 KTM 125 SX has a Dry weight of 93.6 kg (206.4 pounds).

What is the seat height of the 2003 KTM 125 SX?

The 2003 KTM 125 SX has a Seat height of 925 mm (36.4 inches) If adjustable, lowest setting..

KTM 125 SX - 2003 Specifications and Reviews

The 2003 KTM 125 SX is a lightweight motocross machine designed for amateur and intermediate riders seeking aggressive off-road performance. Known for its responsive 125cc two-stroke engine and nimble handling, this bike excels in sand and technical terrain. The compact chassis and 93.6kg weight make it ideal for developing riding skills and enjoying competitive racing.

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2003

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General information
Category	Cross / motocross
Year	2003
Model	KTM 125 SX
Engine and Transmission Specifications
Transmission typefinal drive	Chain
Gearbox	5-speed
Cooling system	Liquid
Fuel system	Carburettor
Bore x stroke	45.0 x 40.8 mm (1.8 x 1.6 inches)
Stroke	2
Engine type	Single cylinder
Capacity:	124.80 ccm (7.62 cubic inches)
Physical measures and capacities
Wheelbase	1,461 mm (57.5 inches)
Ground clearance	390 mm (15.4 inches)
Seat height	925 mm (36.4 inches) If adjustable, lowest setting.
Dry weight	93.6 kg (206.4 pounds)

KTM 125 SX dimensions and frame
Rear brakes diameter	220 mm (8.7 inches)
Rear brakes	Single disc
Front brakes diameter	260 mm (10.2 inches)
Front brakes	Single disc
Rear tyre dimensions	100/90-19
Front tyre dimensions	80/100-21
Rear suspension travel	335 mm (13.2 inches)
Front suspension travel	300 mm (11.8 inches)
Speed and acceleration
Fuel capacity	7.50 litres (1.98 gallons)

Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track95%

City10%

Cornering90%

Daily Riding10%

Touring8%

Passenger5%

Rider Profile

Best For	This is a full-on motocross competition bike best suited to intermediate through expert off-road riders, not beginners or casual road riders.
Purpose	Built purely for closed-course motocross racing, it excels at jumps, berms, and rapid direction changes on dirt tracks rather than any street use.
Rider Fit	The tall 958 mm seat height, aggressive ergonomics, and demanding 2-stroke power delivery require good rider fitness, strength, and prior dirt bike experience.
Character	Light, explosive, and razor-sharp in handling, it rewards aggressive riding with a peaky two-stroke power band and minimal weight to manage.
Not Ideal For	It is not suitable for commuting, highway travel, passengers, or riders seeking comfort, storage, or a forgiving low-end power delivery.

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

Rider Fit Visualizer

2003 KTM 125 SX Rider Ergonomics Assessment

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Feet:

At 925mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2003 KTM 125 SX, with a cramped knee angle of around 80 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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Rider Reviews

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MotorcycleDB Review

The 2003 KTM 125 SX is a lightweight and powerful motocross bike that delivers an exhilarating riding experience. With its 125cc engine and top-notch suspension, this bike is designed for maximum agility and control on the track. The sleek and aggressive design of the 2003 KTM 125 SX is sure to turn heads, while the responsive handling will impress even the most experienced riders. Whether you're a seasoned racer or a novice rider, this bike is sure to deliver the thrills and performance you're looking for. Overall, the 2003 KTM 125 SX is a fantastic choice for anyone looking for a high-performance motocross bike. Its lightweight and agile design make it perfect for tackling tight corners and challenging jumps, while the powerful engine ensures plenty of speed and acceleration. Whether you're hitting the track for a race or just enjoying a day of off-road riding, the 2003 KTM 125 SX is a reliable and impressive choice that won't disappoint. With its sleek design and top-notch performance, this bike is a standout in the world of motocross.