Honda CRF250R
The
Honda CRF250R is Big Red’s four-stroke production motocross bike for the 250F class.
It competes annually in Dirt Rider’s 250 four-stroke shootout and received
fifth place this year. The machine may have slipped down a rank compared to
2020, but that doesn’t mean it lacks in fun. Take the handling and engine as
prime examples that this machine performs well and has a reasonable MSRP.The
CRF250R is powered by a 249cc single-cylinder engine that, when measured on our
in-house dyno, cranked 39.0 hp at 12,900 rpm and 18.8 pound-feet of torque at
9,500 rpm at the rear wheel. And while it didn’t deliver the most peak power of
the group, the CRF250R’s “free-revving engine is one of the characteristics
that make it so much fun to ride,” Dirt Rider’s Andrew Oldar reports. “It
offers a smooth, linear powerband from bottom to top with no real hit anywhere
in the rpm range, all of which contribute to the bike’s ability to get great
traction.”
Yamaha YZ250F
First
introduced in 1974, the Yamaha YZ250 has stood the test of time. The YZ250 is
an ideal bike for a rider who wants a two-stroke motocrosser that is fun to
ride and easy to maintain, while rebelling against the modern-day four-strokes.
It has a long power delivery, plush KYB suspension, and proven durability. Of
the big six manufacturers, Yamaha is one of only three to still offer a 250cc
two-stroke motocross bike in 2020 and is the last premix-burning quarter-liter
MXer from Japan. It’s also the only bike in its category to come with a
cable-actuated clutch.he Yamaha YZ250 hasn’t changed much since 2006, but it
has remained as a competitive package in recent years, as evidenced by a
comparison test conducted by our dirt-only sister publication, Dirt Rider,
between the YZ250 and KTM 250 SX.
KTM 250SX
As
winner of Dirt Rider’s Best Motocross Shootout for two consecutive years (2019
and 2020), the KTM 250 SX-F was bound to stoke the fires of competition, and so
it did. While the Yamaha YZ250F took first place for 2021′s shootout, the KTM
still followed closely behind taking second. Its strong and fast engine, nimble
handling, tunable suspension, light weight, and excellent brakes continue to
serve this machine well. Its high-rpm powerband makes it a suitable ride for
intermediate and pro-level riders.
The KTM 250 SX-F is powered by the same
liquid-cooled, DOHC, 250cc four-stroke engine as its counterpart, the Husqvarna
FC 250. In measuring the machine’s rear wheel power figures for the five-bike
comparison, the SX-F produced the highest horsepower figures and second highest
torque numbers: 41.1 hp at 13,700 rpm and 19.1 pound-feet of torque at 9,100
rpm.While the engine doesn’t produce the strongest low-end power, it excels in
seemingly endless top-end pull. Contributing to its low-end power performance
and rpm recovery characteristics is the bike’s long gear ratios.
Kawasaki KX250X
The Kawasaki KX250 is a four-stroke motocross
bike that takes after its bigger stablemate, the KX450, in
chassis, EFI mapping system, hydraulic clutch, and front brake setup for 2021.
The smaller KX also sees a multitude of other improvements, making it one of
the most revamped models this year.As a well-rounded machine in stock form, the
2021 Kawasaki KX250 offers a nice mix of trickled-down improvements and a
higher revving four-stroke 250cc engine. This model
ranked fourth among the other 250 four-strokes in Dirt Rider’s 2021 250 Four-Stroke Motocross
Bike Comparison Test where it was praised for its neutral-handling
chassis, great ergos, competitive top-end power, and smooth clutch pull. The
KX250 is powered by the 249cc, four-stroke, DOHC liquid-cooled engine. This
dirt bike recorded 39.60 hp at 13,220 rpm and 18.38 pound-feet at 9,440 rpm
on our rear-wheel in-house dyno.
The engine’s
internal components have seen quite a few updates, but characteristics are very
similar to what was seen in 2020. Now it has a little more over-rev because of
the increased rev limit, and power delivery is better if you keep the revs up.
The Dirt Rider 250 four-stroke comparison test did
find that the engine characteristics and power delivery did still leave a bit
to be desired though.Second gear will be used in most corners. Third is not
needed until corner exits and is overall very useful. Fourth only needs to be
used on faster straightaways, we reported in our First Ride
Review. Further, shifting under load was reasonably easy with only a
small amount of clutch lever input needed thanks to the new hydraulic clutch.




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