2021 Suzuki RM-Z450 Dyno Test

Horsepower and torque figures on Suzuki’s 450 motocrosser

Video By: Alec Dare

Although the 2021 Suzuki RM-Z450 did not arrive in time to be included in Dirt Rider’s 2021 450 Motocross Shootout, the RM Army’s flagship motocrosser is in our possession and has been run on our in-house dyno. No mechanical changes have been made to the RM-Z450 for 2021, but it does feature some additional engine-tuning capability with the new MX-Tuner 2.0, which is a system and phone application that allows the user to make adjustments to the EFI via four preprogrammed maps (Aggressive, Smooth, Richer, and Leaner) as well as build custom fuel and ignition maps on the app.

We’re in the process of experimenting with the MX-Tuner 2.0 setup at the track now that the yellow machine has been dynoed, so be on the lookout for the full review of the RM-Z450 to hit the site in the coming weeks. As far as peak figures, with a Dunlop D404 street tire mounted on the rear wheel, the 2021 Suzuki RM-Z450 spun 50.2 hp at 8,800 rpm and 33.2 pound-feet of torque at 7,600 rpm.

2021 Suzuki RM-Z450 Dyno ChartRobert Martin

2021 Suzuki RM-Z450 Engine Specifications

Engine Type: DOHC, liquid-cooled, four-stroke single-cylinder; 4 valves/cyl.
Displacement: 449cc
Bore x Stroke: 96.0 x 62.1mm
Compression Ratio: 12.5:1
Fuel Delivery: Electronic fuel injection