How Much Power Does the 2023 KTM 300 SX Make?

Dyno testing KTM’s 300 two-stroke motocrosser for horsepower and torque.

In addition to overhauling its entire full-size motocross bike lineup with a new chassis, shock, bodywork, and more in 2023, KTM gave its long-standing two-stroke MX bikes—the 125 SX and 250 SX—electronic fuel injection (EFI) and electronic power valves. The Austrian manufacturer also added an exciting new model to its MX lineup for those looking for open-class premix-burning power—the 300 SX.

After sampling the trio of 2023 KTM two-stroke motocross bikes at RedBud MX in Buchanan, Michigan, which were preproduction models, we got our hands on a production 300 SX to test in SoCal. Adhering to Dirt Rider testing protocol, KTM’s first-year big-bore premix-burning motocrosser took its turn on our in-house Dynojet 250i rear-wheel dynamometer with a Dunlop D404 street tire mounted on the rear wheel. Peak figures from the fuel-injected liquid-cooled two-stroke 293cc single-cylinder engine came in at 48.8 hp at 8,100 rpm and 32.2 lb.-ft. of torque at 7,500 rpm.

“The 300 SX has the power to pull up any hill and over any jump at your local track,” test rider Cody Johnston said. “It has that exciting two-stroke powerband we all know and love complemented by good bottom-end that allows for running a taller gear in sections so you don’t have to shift as much. Long live two-strokes!”

2023 KTM 300 SX Dyno ChartRobert Martin

2023 KTM 300 SX Engine Specs

Engine Type: Liquid-cooled, two-stroke single-cylinder
Displacement: 293cc
Bore x Stroke: 72.0 x 72.0mm
Compression Ratio: N/A
Fuel Delivery: Electronic fuel injection w/ 39mm throttle body