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2010 Kawasaki KX250F and KX450F First Look

Tuesday, June 16, 2009
The new Kawasaki motocross bikes are here. As expected, the KX450F gets minor refinements as the R&D team recovers from the massive overhaul in 2009, but the KX250F isn’t the big news we were hoping for. It still received a list of changes, but, I’ll go ahead and spoil it right here, it still has a carburetor. Thanks to slower sales and an abundant inventory supply of KX65 and KX100 models, both 2-stroke machines are on a production hold for 2010. Kids who want fresh greenery will have to look for the KX85 which gets aesthetic upgrades. Read on for the specifics of each Kawasaki dirt bike model.

2010 Kawasaki KX450
The 2010 Kawasaki KX450F is an updated version of the bike that won our 2009 450 Motocross Comparison.
2010 Kawasaki KX450F
Last year’s version blew the doors off with all-new fuel injection, but for 2010 the KX450F isn’t changed as radically. This burly beast is only refined for the new year with adjustments you can’t see from the outside. Inside the motor is a new bridged-box piston. It shaves seven grams and has a 6mm-shorter skirt. Kawi claims it increases performance at the top of the rev range. The intake cam timing is advanced two degrees and ECU settings are tweaked. Kawi says the piston design has been proven through use in the race team bikes along with a wedge-shaped crank which is already in use. By offsetting 60% of the crankshaft’s reciprocating weight, it acts as a counterbalance to smooth the engine delivery and vibrations.

The bike gets 40mm trimmed off the single-piece head/mid-pipe and the friction plates in the clutch get 75% more material. Denso radiators are 10mm taller and 7.6mm wider which brought about new shrouds. The bodywork mounts to a chassis that features a new steering stem shaft with the goal of decreasing rigidity. The Kayaba fork gets a different spring rate and revised damping to ease the initial stroke. The same goes for the rear end where the shock mounts to revised linkage ratios.

All this adds up to an extra 500 bucks for a grand total of $8049.

2010 Kawasaki KX450
A revised ECU tunes the motor and FI.
2010 Kawasaki KX450F Specs:

Liquid-cooled, 4-stroke Single with DOHC and four valve cylinder head
Displacement: 449cc
Bore x stroke: 96.0 x 62.1mm
Compression ratio: 12.5:1
Fuel Injection: 43mm Keihin Throttle body
Ignition: Digital DC-CDI
Transmission: Five-speed
Rake / trail: 26.7 degrees / 4.6 in.
Front suspension / wheel travel: 48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment / 12.4 in.
2010 Kawasaki KX450
Kawasaki revised the fork and shock internals.
Rear suspension / wheel travel: UNI-TRAK® linkage system and Kayaba shock with 50mm piston, 22-position low-speed and stepless high-speed compression dampening, 22-position rebound dampening and fully adjustable spring preload / 12.4 in.
Front tire: 90/100-21
Rear tire: 120/80-19
Front brake: Single semi-floating 250mm petal disc with dual piston caliper
Rear brake: Single 240mm petal disc with single-piston caliper
Overall length: 86.0 in.
Overall width: 32.3 in.
Overall height: 50.4 in.
Wheelbase: 58.3 in.
Ground clearance: 13.4 in.
Seat height: 38.0 in.
Curb weight: 250.4 lbs. claimed
Fuel capacity: 1.9 gal. Color: Lime Green
MSRP: $8049

2010 Kawasaki KX250
This is the disappointing news for 2010, but the KX250F is still going to be one fast motocross bike. We'll just have to see if any of the other OEMs put fuel-injection on their 250F machines.
2010 Kawasaki KX250F
We were hoping the trickle-down effect would happen fast enough for this year’s bike to trade its carburetor for digital fuel injection, but it wasn’t to be. Try not to be too disappointed, though. We had to remind ourselves that the ’09 was a damn fine machine, and a list of improvements aimed at bettering the handling characteristics is a good thing.

Kawi’s quarter-liter gets a bridged-box piston design like the KX450F as well as the wedge-shaped crank web and larger radiators. But, unlike its big brother, the exhaust pipe is longer out of the head and shorter in the middle for boosted low-end grunt. Crankcases are thicker and the tranny is beefed up as well with bigger dogs on third and fourth gears.

Suspension and chassis changes are just like the 450 except that the KX250F uses Showa components. The steering stem has less rigidity and the suspension tuning aims at leveling the bike’s stance so that there is less pressure on the front wheel. That doesn’t necessarily equate to quicker handling in the hypothetical world, but we’ll wait and see how this thing turns at the press launch.

Sure seems like there’s a lot in common with the 450F, and the price hike is no different. If this is the bike for you, the 2010 model rings in at $6999 - an extra 500 bucks over the ’09. Keep your fingers crossed for some First Rides on the KX450F and KX250F in August and September.

2010 Kawasaki KX250F Specs:

Engine: 4-stroke Single with DOHC and four valves
Displacement: 249cc
Bore x stroke: 77.0 x 53.6mm
Cooling: Liquid
Carburetion: Keihin FCR37 and hot start circuit
Compression ratio: 13.2:1
Ignition: Digital CDI with K-TRIC throttle position sensor
Transmission: Five-speed with wet multi-disc manual clutch
Final drive: Chain
Frame: Aluminum perimeter
Rake / trail: 27.4 degrees / 4.7 in.
Front suspension / wheel travel: 47mm inverted Showa twin-chamber telescopic fork with 16-way compression and rebound damping / 12.4 in.
Rear suspension / wheel travel: UNI-TRAK® linkage system and Showa shock with 13-way low-speed and stepless high-speed compression damping, 17-way rebound damping and fully adjustable spring preload / 12.2 in.
Front tire: 80/100-21
Rear tire: 100/90-19
Front brake: Single semi-floating 250mm petal disc with dual piston caliper
Rear brake: Single 240mm petal disc with single-piston caliper
Overall length: 85.4 in.
Overall width: 32.3 in.
Overall height: 50.0 in.
Wheelbase: 57.9 in.
Ground clearance: 13.4 in.
Seat height: 37.6 in.
Curb weight: 231.4 lbs. claimed
Fuel capacity: 2.1 Gal.
Color: Lime Green
MSRP: $6999

2010 Kawasaki KX85
As the sole remaining updated 2-stroke in Kawasaki's dirt bike lineup, the KX85 is holding on with some new graphics and black wheels.
2010 Kawasaki KX85
Kawasaki’s only updated 2-stroke motocross bike is unchanged for 2010 except for some aesthetic cues. Yes, you read correctly – no KX65 or KX100 will be produced this year, however, they have not been dropped entirely from the lineup. Kawi, along with the rest of the motorcycle world, still hasn’t introduced a super-mini-class 4-stroke to combat Honda’s CRF150R.

Some new graphics and black rims freshen things up and apparently are worth an extra $550 (MSRP $3849), but otherwise the KX85 is the same machine as in 2009.

2010 Kawasaki KX85 Specs:

Engine: 2-stroke single with KIPS®
Displacement: 84cc
Bore x stroke: 48.5 x 45.8mm
Cooling: Liquid
Carburetion: Keihin PWK28
Induction: Crankcase reed valve
Compression ratio: 10.0:1 (low speed) – 9.2:1 (high speed)
Ignition: Digital CDI
Transmission: Six-speed
Final drive: Chain
Frame: High-tensile steel perimeter design with subframe member
Rake / trail: 27 degrees / 3.5 in.
Front suspension / wheel travel: 36mm inverted telescopic cartridge fork with 18-way compression damping / 10.8 in.
Rear suspension / wheel travel: UNI-TRAK® single-shock system with 4-way compression and 16-way rebound damping, plus adjustable spring preload / 10.8 in.
Front tire: 70/100x17
Rear tire: 90/100x14
Front brake / rear brake: Hydraulic disc / Disc
Overall length: 71.7 in.
Overall width: 28.9 in.
Overall height: 41.5 in.
Ground clearance: 13.4 in.
Seat height: 33.1 in.
Curb weight: 152.1 lbs. claimed
Fuel capacity: 1.5 gal.
Wheelbase: 49.4 in.
Color: Lime Green/Ebony
MSRP: $3849
2010 Kawasaki Dirt Bike Photo Gallery
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the king of motocross -awsome bike  October 18, 2010 06:03 PM
its and awsome bike good power
cameron -wini  September 24, 2010 01:42 AM
hey I was wondering if I could trade in my motorbike for a KX 85cc cause I am interested in racing
ty -personal preff  July 23, 2010 01:08 AM
holy crap listen to all of u. decide what u like.... buy what u like.... like it.... love it.... shut up and go ride....
steve fallett -Wow  June 10, 2010 07:11 PM
how could you ride this bike there is no bottom end or top end 2010 yamaha 250 2 stroke will pull this bike of the charts
zach -these are nice bikes  May 16, 2010 09:24 PM
this years 2010 kawasaki 250cc and 450cc are very nice i myself think anybody going to look for a new bike should go and by one of these nice running bikes.Im very happy with what kawasaki has gave the dirtbike nation.
sidney -??  May 10, 2010 08:45 AM
how much does it weigh
michael hullett -braaaap  April 20, 2010 09:17 AM
its not hard i went from a kx 85 then to a 450 and i didnt have a problem, plus i was 14
IEUAN turner -why do my kx go up rev  March 10, 2010 03:48 AM
tell me
metalman -2 stroke vs 4 stroke  March 3, 2010 12:46 PM
i have 03 250 kaw 2-stroke and a 06 kaw 450f .the 2-stroke is more responsive and quicker.450f alright seem slugish but not bad . i,m not a pro but i don,t see how 4-stroke is that much better.annnnnd why the 2-stroke is being phased out ??
dirtnap 666 -BRING EM BAK  February 11, 2010 06:28 PM
Man i hear whad y'all lads are sayin and i think it's damn sad and to whoever keeps askin about the 2010 kx 100 sadly no...no they dont and i think they will start to make the 2-strokes again because of the new 2stroke motor out i cant rememebr the name but its eficient and obviousely if yamaha can make a yz 250 then kawi should BRING ON BAK THE KX 125
justin -kawasaki vs. yamaha  February 1, 2010 08:02 AM
i personally think yamaha is way better than kawasaki my brother had a 250 and u couldnt keep the front tire on the ground it had alot of power in low end and high end
200 -Price and stroke  February 1, 2010 04:34 AM
Ill stick with some of you guys. Its sad we cant buy a brand new 125 and 250cc 2-stroke. Or 65cc 2-stroke in that case. Fantastic bikes. And now kawi doesnt even have a 125 to compete in the new World Championship 125 2-stroke class.
Though you guys in America shouldnt be bothered about the price. In Denmark (Europe) a 2010 KX 250F costs 10.500$.
jackson -kx 125  November 26, 2009 06:41 PM
i agree i have a 2008 kx125 to and i wanted to get a 09 but they didnt make one so ive got to get a yz 125 know.
Ray Hymes -125cc 2 strokes?  November 23, 2009 05:55 PM
i am looking for a Kawasaki 125cc dirt bike, i was wondering if any 2 strokes were made recently. I prefer 2 strokes for the low end power and the launching power. I ride where low end thrust is needed more often than high end speed. I am wanting specks and price range, along with any upgrades available from the factory. Thank you for your time. Raymond Hymes, 17 years old
trey -i like  November 15, 2009 04:34 PM
i like that kx85 2010
bob mcfarlane -250fcc  November 15, 2009 12:54 AM
make a dual injected kx250f plz
brandon -$$$  October 20, 2009 08:45 AM
i wish i had the money for the 250 but the asking price i think should be lower


moto x bike prices should go down they will make way more sales
pbr30 -winner  October 16, 2009 05:31 AM
is there a 2010 kx 100
MTB#75 -price  September 14, 2009 07:53 PM
you shouldn't complain about the price! in Ecuador, south america it costs like $9000 !!!!
JHammer146 -250f  September 9, 2009 05:56 PM
i don't think its hard to go from an 85 to a 250f. I did it and every other young racer i know did it. Just about how good you are and how big you are. But the new 250f is sick. The cost is a bit pricey, but it looks pretty damn good. The only thing i don't like id how the pipe is out in the open...
jK -450cc  August 28, 2009 01:07 PM
those bikes look sick
A+ -4 Stroke cost  August 23, 2009 03:45 PM
Just another way Global warming hoax has cost us money, 4 strokes are more expensive to buy and more expensive to maintain. And they are hard to transition between for young riders. Very hard to go from a KX 85 to a KX 250f.
KawiKid -250cc  August 17, 2009 05:44 AM
fuel injection kx250 2stroker plz kawasaki :D that would b awsome
Shane -What?  August 13, 2009 10:52 PM
john what are you talking about? you gain power with fuel injected way more power!
john -2 stroke yuck  August 12, 2009 02:21 PM
2 stroke bikes are fun. The four stroke bikes have a lot of power and sound AMAZING! Ive heard a kx100 and a kx250f racing, the 2 strokes sound like crapy "wap wap waaaap" while the kx250f and 450f sounds like roaring thunder "BROAAAARRRRR". Just my opinion!
john -fuel injected?  August 12, 2009 02:17 PM
fuel injected bikes suck. so what if they are a little more fuel effecient, you loose power. some new 450f like the cr450f is fuel injected and you loose a lot of power. the carbuerated motors are the bomb. i want a kx250f.
Shane -NOT FUEL INJECTED!!  August 10, 2009 08:42 PM
I was so lookin forward to them being fuel injected and now i read this and there not.... so dissapointed :(
Jamie -Two Strokes  August 10, 2009 02:18 PM
Bring them back guys my 08 Kx250R was the best bike ever but now having to move to Yamaha just to get the two stoke power again.
DYLBALLS -YAMAHA GYTR RACING  August 10, 2009 03:32 AM
ben -bing back 2 stroke  August 9, 2009 01:34 AM
i have an 2005 kx 125 and a 2008 kx250f and i can go faster on the 125 and its more fun
1904 clothing -kawai 450  August 5, 2009 09:41 PM
love my 09 450 kawi........thought id never leave a 2 smoke, but this bike is a dream, rider for life,
BENJI -KX250f  August 4, 2009 07:20 PM
my son wants a kx250f but they cost so damned much wow
big ben -125 two strokes  July 21, 2009 03:26 AM
althought the ktm two strokes look awsome
big ben -125 two strokes  July 21, 2009 03:23 AM
stop complaining how they dont make the 125 two strokes. four strokes are where its at. they have more power across the power range and are more grunty than 2 strokes.
skungebobnopants -....  July 18, 2009 07:02 AM
I hope they changed the damn offset to 22mm. I would rather not pay $600 for pro circus triple clamps right from the get go... damn retards seem to have left the exhaust at 99db too!
mark -nice  July 17, 2009 10:05 PM
This bike I think is the best bike out there. It has a lot of power and you can have a lot of fun with all that power. I do agree its a little pricy but i bet its worth every penny.
muva -this is my future bike??? but it is very high price???  July 9, 2009 01:26 AM
i need more money that i can bye a 450kx|....
craig -priced to high?  June 27, 2009 03:47 AM
i agree that the cost of everything is insane,but relative increases to dirtbike cost for the improvements on these machines beats what you would get on a high end sports car.if you or i could ride a 450f to its full potential,we would be standing on the podium week after week,EFI,SUSPENSION,TESTING IN REAL WORLD.ALOT OF BANG FOR YOUR BUCK.i cant drop my truck 2ft let alone20-30ft pick it up and ride it like it never happend.todays bikes are better stronger and more beautiful than ever,with the release of each model,im closer to buying a new bike,also 2stroke fans KTM has every dissplacement you can imagine check them out!
Dusty Roads -$$$$$  June 25, 2009 04:22 AM
MX Bikes are just too expensive!!! $8,000 for the 450!!!! Their pricing themselves out of business...sure I'd like one but too much $$$$$$
Big D -Kawasaki  June 24, 2009 02:42 PM
125 two strokes are the most fun of all. If the other company's don't want to make them I'll just continue to buy YZ125's which have been the best and most fun dirt bikes for sometime now.
jim -i agree  June 23, 2009 09:56 AM
boss told me that i was getting an raise last week i didnt get my raise so i ask him and he said that the bussniness was closing down i was saving up to get my son a bike and all i have is 4000 dollars to buy a new one!
mark -to much  June 23, 2009 09:48 AM
you need to lower the prices of the bikes kawi in this time its hard to pay for this bikes my son wants a 250f but no the motocycyle cost to much!!
bheem -comment about bike  June 22, 2009 10:41 PM
this bike look's are very bad..........
WL -125cc  June 20, 2009 09:12 AM
Agree, my son had a 65, 85 and 100 Kawi but we had to switch to blue for the 125. Kawi needs a better transition bike. I have a hard time putting my 12 yo on a 250F.
LB -2 strokes  June 18, 2009 11:07 PM
I agree please kawasaki bring back the KX 125 and KX 250 2 strokes
Rob -KX 2 strokes  June 18, 2009 02:43 PM
Please Kawasaki, bring back both KX125 and KX250, 2 strokes are still more fun and in a tough economy, their cheaper maintenance make an obvious choice for those who don't have to meet certain race restrictions and prefer that characteristic powerband, smell and efficiency. Ask Yamaha and KTM how they are selling their smokers...
deman -dirtbike  June 18, 2009 09:44 AM
where can i find a $200 dirtbike
JC -KX 2-strokes  June 17, 2009 05:02 PM
Unless you got your bike from outside the States, your KX125 is probably even older! Kawi stopped bringing the 125 to America after 2005 (KX250F showed up in 2006) and the KX250 dropped off the USA radar in 2008. But just to be clear, the KX65, KX85 and KX100 are still available at dealers. The 65 and 100 are not being produced as a 2010 model year, but that's because there are enough of them still sitting on showroom floors to meet dwindling demand.
Denmark -125cc  June 17, 2009 03:16 PM
cant believe they dropped one more 2-stroke - i have a 08 kx125cc, the best bike iv'e ever had. Next year im going on a Yamaha YZ 125, because i no longer can buy a brand new kx125. They got to make those 2-strokes again, not everybody can jump directly from 85cc to 250f. So... BACK TO WORK KAWASAKI, and make us a new freshed up cool KX 125cc !!!