2021 GasGas EX 250F Dyno Test

The first-ever four-stroke GasGas dirt bike to hit the Dirt Rider dyno

Video By: Bert Beltran

While the 2021 GasGas EX 250F has a lot in common with the 2021 KTM 250 XC-F cross-country model and, to a slightly lesser extent, the 2021 KTM 250 SX-F motocrosser which we recently dyno tested, the EX 250F is still technically the first-ever four-stroke GasGas dirt bike to spin the drum on Dirt Rider’s in-house Dynojet 250i rear-wheel dynamometer. How did GasGas’ 250 four-stroke cross-country model fare?

Its peak figures of 39.3 hp at 13,300 rpm and 18.8 pound-feet of torque at 9,200 rpm are on par with most of the Japanese-built 250F motocrossers, but 1.8 hp and 0.3 pound-feet of torque less than the 250 SX-F at peak. The factors that could attribute to this are the EX 250F doesn’t come with an optional ventilated airbox cover or map/traction control switch like the 250 SX-F—which provides access to the more aggressive map 2—and it features a straight-tube header pipe as opposed to the KTM’s resonance-chamber-equipped unit.

The EX 250F has a serious dip on the horsepower and torque curve from 4,300 to 4,700 rpm, at which point it begins climbing again and takes an even more upward trajectory at 5,300 rpm. Past that, it maintains a fairly linear horsepower and torque curve throughout the rest of the rpm range. It is worth noting that we did several pulls on the red Austrian bike to ensure its low-rpm stumble wasn’t a fluke, but it happened on each run. We will be testing the EX 250F in the coming weeks to see how it performs on the trail, so stay tuned for our review to hit the site in the near future.

2021 GasGas EX 250F Dyno ChartMichael Gilbert

2021 GasGas EX 250F Engine Specifications

Type: Liquid-cooled, DOHC, four-stroke single-cylinder; 4 valves/cyl.
Bore x Stroke: 78.0 x 52.3mm
Displacement: 250cc
Compression Ratio: 14.4:1
Fuel Delivery: Electronic fuel injection