2010 Kawasaki Ninja 250R Review - Motorcycle.com

Jeff Cobb
by Jeff Cobb

It looks like a hypersport, but its seating position is as comfortable as a standard’s. It’s named after a line of superfast bikes, but is sedate enough for beginners. Its build quality is high, but its price is about as low as it gets.

But then, does Kawasaki’s Ninja 250R even need an introduction? Since receiving a stylistic and functional makeover in 2008, which you can read about here, the Ninja has continued its legacy as a top seller for Team Green.

To those of us who’ve known this little screamer for a while now, it’s not a mystery. Perhaps the only mystery in our minds is why the other Japanese OEMs have been content to let Kawasaki own this segment for the past couple of decades or more, but we’ll save that for the sidebar.

For those of you who need a refresher, here goes:

Light and able to cut lines like a Tanto knife, the Ninja 250R especially excels on tighter roads.

The Numbers

Motivated by a smooth-running DOHC 249cc parallel-Twin pushing a peak of 25.4 hp to the rear wheel, this 374-lb machine offers enough power to stay ahead of around-town and suburban traffic, and will top out around an indicated 100 mph or so.

Its twin Keihin constant-velocity carburetors aren’t as sophisticated as the fuel-injection on the Euro version, and the twin carbs are jetted lean to pass emissions regs. This results in an engine that needs to be warmed up before it’s able to be ridden away, and low-end throttle response is a bit soggy.

“It’s definitely on the lean side in the low end and midrange,” says Kerry Bryant, who has tuned many Ninja 250s as owner of Area P, a SoCal-based shop that also manufactures exhaust systems. “Changing/adjusting the jetting can make a dramatic improvement in throttle response, even with the OEM exhaust system.”

Once warmed up after a few minutes, the machine will accelerate from a standstill with the revs at around 3,000 rpm while slipping the clutch. Carburetor tuning is not a pre-requisite, but to make it run the way it could, it is something we would do.

The Ninja’s lean low-end and midrange jetting results in soft response below 5000 rpm when its torque production finally gets with the program.

For optimum performance, Bryant recommends a Dynojet kit. Short of this, improvement could be had by simply adjusting the fuel mixture screws to see how that works first. This tweak can be done by a qualified technician, or competent do-it-yourselfers and can be discussed with a dealer’s service department.

“Adjustments depend on elevation, temp and humidity (and of course other mods made to the bike such as aftermarket exhaust, airbox, etc.),” Bryant elaborates for those wanting to fully tune their Ninjas. “For our particular location and conditions, adjusting the fuel mixture screws out 2.5 - 3.0 turns (from bottom out) improves the low-end. Replacing the needles with a different taper and adjustable clips will improve the mid-range. Main jet size normally ends up being #98 (Dynojet [brand] jet kit sizes/numbers and not to be confused with the OEM Keihin sizes/numbers).”

It’s a full-size sportbike with a quarter-liter engine. Its looks leave little doubt about its family line.

With a jet kit installed, Bryant says, “The primary difference a street rider will notice is throttle response more than anything else. It will now feel like your right hand actually controls and modulates the power input like it should be.”

In stock trim, the liquid-cooled mill is reliable and quick. Although the power delivery is soft off the bottom and requires some clutch slipping, it responds with enthusiasm once past 8,000 rpm until 11,500 rpm when power begins tapering off before hitting the 13,000-rpm rev limit. A brisk pace requires gear changes to its six-speed transmission at short intervals.

The powerplant rolls within a steel diamond-style frame, utilizing Kawasaki’s Uni-Trak rear suspension with five-position preload, in conjunction with a 37mm telescopic fork canted at a stable yet nimble 26 degrees rake, and 3.2 inches trail.

Slowing it all down are brakes that are reliable and drama-free. A single 290mm front rotor clamped by a twin-piston caliper does most of the work, with the 220mm rear and twin-piston caliper rear there for backup.

Its Purpose

The Ninja’s seat-handlebar-peg relationship is comfortably neutral. Six-foot rider shown.

The Ninja 250R’s aerodynamic bodywork and styling looks remarkably similar to the ZX-6R and ZX-10R, and that is purely not coincidental. There’s no “250” emblem on this big little 250, and that’s no mistake either.

But before we start talking about the Ninja’s sporting capability, let’s be clear about its mission. It is an entry-level sportbike, to be sure, but its upright handlebars and low 30.5-inch seat height make it a user-friendly all-rounder, not unlike Kawasaki’s larger parallel-Twin Ninjas.

As such, this bike is quite suitable for commuting, and we saw upwards of 50 mpg sipped from its comparatively large 4.8-gallon fuel tank, even while testing redline on a regular basis.

Its fairing and windshield offer suitable protection from wind buffeting, and if we can be utterly biased for a moment, we think commuters also looking for a bit of weekend fun might be more satisfied with this 250 over, say, a comparable displacement scooter.

An aftermarket undertail kit would show off the slimmer design Kawasaki gave it a couple years back.

A trip to the aftermarket for luggage options would also be advisable to add to this bike’s utility, or just strapping on a duffel bag to the rear seat could do the trick.

As a Sportbike

The Ninja 250R is sane fun for the street. We won’t pretend to say it’s as adrenaline-inducing as a ZX-6R, but it didn't exactly put us to sleep either.

Acceleration is brisk, and gear changes come fast and crisply. If determined, a rider can twist its tail into the indicated red zone. Whether this is good policy or needed is another issue. As the dyno chart indicates, power progressively drops off past 11,000 rpm, so there’s not much point to flogging it.

When the road gets twisty, cornering is predictable. Its suspension, with 4.7-inches front and 5.1-inches rear travel is reasonably compliant for riders up to 220 lbs or so. Much heavier riders, or those intending to trounce down rough roads, may wish for more adjustability.

The close-up, wide angle shot shows how low I sit. On another day while wearing leathers, knee scraping was no problem during tight, low-speed cornering practice.

Riders accustomed to bikes with four times the power will feel underwhelmed on sweepers because this bike doesn’t go into warp drive when requested like a literbike can, but newer riders, or those just not looking for a ten-tenths experience ought to enjoy the ride. On tighter roads, the Ninja 250R leaves little to be desired. Assuming the rider has the skills, its lighter weight, quick and neutral steering can give larger and faster bikes a run for their money.

Stock tires for our California bike were IRC RX-01 front and rear specific, although Kawasaki may spec equivalent Bridgestones and Dunlops in other regions. Sized at 110/70-17 front, and 130/70-17 rear, the IRC rubber is plenty adequate for most uses. Aggressive riders may want to experiment with premium sport-compound tires when the originals eventually wear out.

To complete its role as an entry-level sportbike, there’s another benefit potentially available. While wearing race leathers during parking lot cornering practice, we discovered that compared to some larger sportbikes, the Ninja’s low saddle and confident handling makes scuffing knee pucks somewhat easier

In a Class by Itself

One compelling reason to consider a bike like the Ninja 250R is, if you live in the U.S., you can use all the power this bike has on the street legally. Novel concept, isn’t it?

Anyone who’s ridden a fast 600 or literbike knows what I’m talking about. Scream it through four gears, and you’re doing a buck-fifty in about 12-15 seconds.

Kids, don’t try that at home. But if you do, you could get a prize. Yep, your local government will be more than happy to give you a free ride in a police car!

In all seriousness, the big mystery to us is why have all the other Japanese OEMs allowed Kawasaki Motor Corporation to have an almost exclusive market segment all to itself for so long?

Requests for info from Yamaha, Honda and Suzuki, while slightly illuminating, really gave no further clarity on this question for us to report, so we’ll just tell you what we think.

Way back in 1988, the introduction of the then-new Ninja 250 was credited with momentarily spiking KMC to the top of the U.S. sales charts – even above mighty Honda. Since then, the Ninja 250R has been established into a perennial best seller.

As a quintessential beginner’s bike, we think there might be more room in the wading pool for the other OEMs to jump in with 250 sportbikes of their own. Of course, the over-documented recession looming above the North American market is ample opportunity for plausible deniability at the moment, but this has been going on for decades.

We’ve already documented in a previous sidebar, we do not think 600cc sportbikes are necessarily good “entry level” bikes, but sales to newbies of large and fast bikes have been the trend here in the good ol’ US of A, where bigger is too often touted as better.

Actually, since there’s no tiered licensing here, there’s less incentive for OEMs to import smaller sportbikes already being sold elsewhere in the world. And it’s a ripe opportunity for marketers and dealers to play into Americans’ natural sensibility, and up-sell bigger bikes, which of course, earn larger profits.

Please indulge us for a moment here, while we adamantly repeat: We think it’s usually safer and better for novices to learn on a competent bike that doesn’t have overwhelming power until skills are developed.

Yes, the 250R is slow compared to its bigger brothers, but that’s not a bad thing. If you opt for bigger, we respect that, but advise that you also be sure to self-evaluate that you have the inherent talents to grow into it quickly.


As an All-Rounder

Add bags, and you’ll have an able commuter.

The Ninja 250R runs at high rpm – as high as 8-12,000 rpm or more on the highway – but it’s built for it with features like reinforced pistons and direct valve actuation. The powerband is healthy throughout this range, and begins to taper below redline so riders are less tempted to excessively hammer it. This is a deliberately engineered safeguard meant to discourage over-revving, thereby increasing longevity.

At 374 lbs, the quarter-liter Ninja is kind of porky considering the lightest literbikes weigh only 65 lbs more. On the plus side, this weight makes it more stable when holding your space among large vehicles on open roadways, and in staving off the affects of strong crosswinds.

A big center-mounted speedometer dominates the functional instrument cluster, and a smaller tachometer on the left matches the right-side fuel gauge. Switchgear is likewise functional, and of typical good Japanese quality.

Instruments are basic and clearly visible day or night. The fuel gauge moves very slowly. After one 105-mile flog session of mixed highway and canyon riding, it indicated a little less than half a tank remaining.

Around town, the gearbox still gets used a lot. Running up a suburban side street can require two or three gear changes. Handling and braking are confidence inspiring here, as they are everywhere else.


The Ninja 250R has a suggested price of $3,999 ($4,299 for the Special Edition tested). It has the capability to be the only bike some riders ever need, and is particularly suited as an entry-level motorcycle to add to the list of choices compiled by veteran MO staffer, Pete Brissette, in his excellent primer on the subject.

The special edition comes with Team Green color and graphics, and matching passenger pillion.

We glossed over some of the 250R’s details, but Kawasaki’s engineers didn’t. A quick look at KMC’s spec sheet shows they have thought about every aspect of this machine’s design and construction, and we have no reason to doubt it.

The 250R has a known-good reliability record and is built to last. There are a couple other Asian 250s in the sportbike class, but as the only Japanese 250 imported to the U.S., the Ninja 250R is a class act that’s in a class by itself.

Related Reading
2009 250cc Streetbike Shootout
2008 Kawasaki Ninja 250R Review
2010 Bennche Megelli 250R Review
2010 Kawasaki Ninja 650 vs. 2009 Suzuki GSX650F vs. 2010 Yamaha FZ6R
Kawasaki Ninja 250R
Top 10 Least Expensive (Cheapest) Sportbikes of 2009 by MSRP
Should You Ride a Motorcycle?
What to Wear When You Ride and Why
Riding With a Passenger

Jeff Cobb
Jeff Cobb

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