What category is the 2005 KTM 125 SX?

The 2005 KTM 125 SX has a Category of Cross / motocross.

What is the engine size of the 2005 KTM 125 SX?

The 2005 KTM 125 SX has a Capacity: of 124.80 ccm (7.62 cubic inches).

What type of engine does the 2005 KTM 125 SX have?

The 2005 KTM 125 SX has a Engine type of Single cylinder.

Is the 2005 KTM 125 SX air cooled or liquid cooled?

The 2005 KTM 125 SX has a Cooling system of Liquid.

How many gears does the 2005 KTM 125 SX have?

The 2005 KTM 125 SX has a Gearbox of 5-speed.

How much does the 2005 KTM 125 SX weigh?

The 2005 KTM 125 SX has a Dry weight of 92.4 kg (203.7 pounds).

What is the seat height of the 2005 KTM 125 SX?

The 2005 KTM 125 SX has a Seat height of 925 mm (36.4 inches) If adjustable, lowest setting..

KTM 125 SX - 2005 Specifications and Reviews

Name: 2005 KTM 125 SX
Brand: KTM

The 2005 KTM 125 SX is a lightweight motocross machine designed for young riders and beginners entering competitive off-road racing. Powered by a liquid-cooled 125cc two-stroke single-cylinder engine with a five-speed gearbox, it delivers responsive performance and agility on the track. Known for its reliable construction and user-friendly handling characteristics, the 125 SX remains a popular choice for developing fundamental riding skills in motocross.

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2005

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General information
Category	Cross / motocross
Year	2005
Model	KTM 125 SX

Engine and Transmission Specifications
Clutch	Wet multi-disc clutch, operated hydraulically
Transmission typefinal drive	Chain
Gearbox	5-speed
Cooling system	Liquid
Lubrication system	Mixture oil lubrication 1:40
Starter	Kick
Ignition	Kokusan digital 2K-1
Fuel system	Carburettor. Keihin PWK 39
Bore x stroke	54.0 x 54.5 mm (2.1 x 2.1 inches)
Stroke	2
Engine type	Single cylinder
Capacity:	124.80 ccm (7.62 cubic inches)
Physical measures and capacities
Wheelbase	1,471 mm (57.9 inches)
Ground clearance	390 mm (15.4 inches)
Seat height	925 mm (36.4 inches) If adjustable, lowest setting.
Dry weight	92.4 kg (203.7 pounds)

KTM 125 SX dimensions and frame
Rear brakes diameter	260 mm (10.2 inches)
Rear brakes	Single disc
Front brakes diameter	216 mm (8.5 inches)
Front brakes	Single disc
Rear suspension travel	335 mm (13.2 inches)
Rear suspension	WP-PDS-DA shock absorber
Front suspension travel	300 mm (11.8 inches)
Front suspension	WP-USD 48 mm (1.89 inch.)
Trail	120 mm (4.7 inches)
Rake (fork angle)	27.0°
Frame type	Chromium molybdenum
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

2005 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 2005 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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