How Much Power Does the 2023 Honda CRF450RX Make?

Dyno testing Honda’s flagship cross-country racer for horsepower and torque.

In addition to chassis and suspension revisions, Honda gave its flagship cross-country model some engine updates for 2023 including a narrower intake port shape and longer intake funnel, both to improve response and torque. Big Red also changed the camshaft profile to further increase torque, and a smaller-diameter throttle body (44mm versus 46mm on the 2021 and 2022 models) was spec’d to create a smoother power delivery at low speeds.

After testing the 2023 Honda CRF450RX at Chocolate Mountain Ranch near San Diego, California, we brought it back to our office to see what it could do on our in-house dyno. With a drum-roller-friendly Dunlop D404 street tire mounted on its 18-inch rear wheel, the CRF450RX proceeded to tally 51.0 hp at 9,300 rpm and 34.1 lb.-ft. of torque at 6,800 rpm. Compared to the 2021 model, that’s a decrease of 2.2 hp and 0.2 lb.-ft. of torque at peak, but such is not a concern for a fire-breathing racebike like the CRF450RX.

“Updated engine specs are a step in the right direction,” test rider Casey Casper said. “The CRF450RX is still strong and powerful, but more manageable. Now riders can go more than a lap or two without feeling the brunt of the Honda engine.”

2023 Honda CRF450RX Dyno ChartRobert Martin

2023 Honda CRF450RX Engine Specs

Engine Type: SOHC, liquid-cooled, four-stroke single-cylinder; 4 valves/cyl.
Displacement: 449cc
Bore x Stroke: 96.0 x 62.1mm
Compression Ratio: 13.5:1
Fuel Delivery: Electronic fuel injection w/ 44mm throttle body