What is the engine displacement of the 2026 KTM 125 SX?

The 2026 KTM 125 SX has an engine displacement of 124.8 cc.

2026 KTM 125 SX Price, Specs, Review

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Review

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The KTM 125 SX 2026 is a model that stands out in the motocross world with its lightness and high performance. Its 124.8 cc single-cylinder, 2-stroke engine is equipped with a Keihin EFI 39 mm throttle body. Managed by the Vitesco Technologies EMS system, this engine features a 6-speed transmission. The wet multi-disc DS clutch is controlled by a Brembo hydraulic system. The chassis is a central double-cradle type made of 25CrMo4 steel, supported by an aluminum-reinforced polyamide rear subframe. The front suspension consists of a 48 mm WP XACT-USD (AER) inverted fork, while the rear suspension is a WP XACT monoshock with linkage. The front wheel travel is 310 mm, and the rear wheel travel is 300 mm. With a dry weight of 92 kg, this model has a seat height of 958 mm and a ground clearance of 359 mm. Its approximately 7.2-liter fuel tank capacity makes it suitable for long rides. The KTM 125 SX 2026, with its advanced technology and ergonomic design, is an ideal choice for motocross enthusiasts.

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License Class (EU)

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Rule of thumb: under 125cc / 15HP → A1, under 47HP → A2, above → A.

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Fuel Economy & Running Costs

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Estimated average for 125cc class: 75-100 mpg (2.5-3.5 L/100km)

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Insurance Class

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Insurance grouping for KTM 125 SX (125cc):