14 August. Friday 2026
KTM 125 SX - 2012 Specifications and Reviews
The 2012 KTM 125 SX is a lightweight two-stroke enduro bike designed for young riders and beginners seeking an affordable entry into off-road racing. Known for its nimble handling and powerful power-to-weight ratio, this liquid-cooled single-cylinder machine delivers responsive performance across varied terrain. The six-speed gearbox and hydraulic clutch provide smooth control for developing riders mastering fundamental motocross skills.
General information | |
| Category | Enduro / offroad |
| Year | 2012 |
| Model | KTM 125 SX |
Engine and Transmission Specifications | |
| Driveline | 13:50 |
| Clutch | Wet mDouble disk clutch / hydraulically operated |
| Transmission type,final drive | Chain |
| Gearbox | 6-speed |
| Cooling system | Liquid |
| Lubrication system | Mixture oil lubrication 1:40 |
| Ignition | Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan |
| Fuel system | Carburettor. Keihin PWK 38S AG |
| Bore x stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Engine details | Reed intake and exhaust control |
| Engine type | Single cylinder, two-stroke |
| Capacity: | 124.80 ccm (7.62 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| 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 | 330 mm (13.0 inches) |
| Rear suspension | WPSuspension |
| Front suspension travel | 300 mm (11.8 inches) |
| Front suspension | WPSuspension |
| Rake (fork angle) | 26.5° |
| Frame type | Central tube frame made of chrome molybdenum steel tubing |
Physical measures and capacities | |
| Fuel capacity | 7.50 litres (1.98 gallons) |
| Wheelbase | 1,480 mm (58.3 inches) |
| Ground clearance | 395 mm (15.6 inches) |
| Seat height | 992 mm (39.1 inches) If adjustable, lowest setting. |
| Dry weight | 91.6 kg (201.9 pounds) |
| | |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Orange/black/white |
| Starter | Kick |
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.
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