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The KFX®400 is for serious sport riders who demand high-performance for the track, trails and dunes. And the KFX400 delivers, thanks to its high-tech, four-stroke engine, manual transmission, lightweight racing-type chassis and disc brakes. This four-wheeled Kawasaki is propelled by a highly responsive 398cc, liquid-cooled, four-stroke engine with double overhead cams and four valves atop a chrome composite-plated aluminum alloy cylinder. Fed by a 37mm high-performance carburetor, it includes electric start and has a counterbalancer to reduce vibration. The KFX400 engine utilizes a “dry sump” design, shortening overall engine height so it can be placed lower in the chassis for enhanced stability while providing higher ground clearance. Transmitting power from the engine to the rear wheels is a high-performance five-speed-plus-reverse manual transmission and efficient O-ring chain.  Such power requires a chassis to match, so the KFX400 ATV engine rides in a high-tensile steel frame and subframe. Suspension duties are handled by dual front A-arms with fully adjustable shocks that provide 8.5 inches of travel, while an aluminum-alloy swingarm with fully adjustable shock provides 9.1 inches of travel on the rear. Contributing to the KFX400’s low, 373-pound dry weight are competition-inspired aluminum-alloy wheels, and stopping power is provided by dual front disc brakes and a single rear disc brake. Kawasaki KFX 400 Specifications
FEATURES
31 comments: Kawasaki KFX 400 i have a kfx 400 and it has a white brothers slip on a 410 kit and jetted charb it runs about 70-75 mph i race it with built 450s and beat em u dont have to have alot of bike for a track you have to have skill
i own a 2004 kfx400. its tough to keep it running if u ride it to the limits but it had lots of pick up even with stock sprockets. ive reccomended it to many people. i have also absolutely smoked a 400ex, its got the speed even when geared down, shortly after i rolled mine, my handle bars snapped off whick is kinda a pain in the if you 50 kms away from anything so if u roll it, get the bars changed or your gonna have problems later, i also have to agree with the motor burning oil an the timing chaing having to be adjusted but overall its a great machine with lots of power and speed, she’ll do anything u want her to as long as u have the money to fix it later
brandon baxley (6682) - Posted on 03.17.2008 this bike is so great that if u want a quad u shold get it...... its got speed power and every thing else get it
brandon (6682) - Posted on 03.17.2008 this bike is so crappy i can beat it on my 300ex the kfx is so great i would recommond it to evey body in the world
erick again (6682) - Posted on 03.16.2008 i want to buy a 2004 kfx 400 but i wanna know is it fast if it is how fast can it go i wanna know and if it haves problems like does break fast or runs out of gas fast help plz ???????
erick (6682) - Posted on 03.16.2008 i want yo buy one but is it fast and those is it break fast???? help plz
tatersalad (6682) - Posted on 03.8.2008 I own the ltz 400 which is that same exact motor and frame. I really have beat the kfx 450 but i have a yoshi pipe and k&n filter. the only reason i beat the 450 was he had too much power for the loose gravel and just spun before taking off in second gear.
I just got a KFX400 and I have the same problems with my gas valve in ON position, it would just die after I get lower then 1/2 tank. It doesn’t seem to want to go back into NEUTRAL after riding it for a period of time. You have to go to 2nd then down or turn it off then on to putt it in N. Anyone else have this problems?
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Posted on
02.24.2012 @ 21:46
Great bike, owned mine (a 2003 model) for about 3 years now. When both are in stock form, it will beat a 400EX in a drag race. But unless all you do is straight lines, they are pretty much equal. The one thing that makes this machine stand out on a long ride is the T-shaped seat. It is by far the most comfy seat on any sport quad I have driven. Honestly, if you want a comfier ride than what the KFX400 offers when you aren’t tearing up a trail like a madman, you will have to look at a Polaris Sportsman model. The seat is that good!
Compared to the rest of the sport market like the 450’s and larger, the handling is right on par with the rest of them, if not better than some of them. The only few that I can think of that it is better for general handling aspects is the Raptor 660’s (Raptor 700’s are improved over the 660 making it on par with the KFX400), DS650’s, KFX700’s, and the Predator/Outlaw line. The main reason for this is all of these machines are quite heavy for a sport quad, but they do have much more power than the KFX400 to back it up in the open spaces. Only the Polaris machines will have a hard time reeling the KFX400 back in when in the open ground where it can put down its power. The same goes for the 450’s, but since they are among the same weight as the KFX400, their high strung 450 powerplants can almost always overcome the 400 given that the rider’s abilities are equal.
I am not saying the KFX400 is slow, but the acceleration to its top speed just takes longer than a typical 450. For those of you who just HAVE to know the "top speed" of the KFX400, I have logged a top speed so far of 69mph with aftermarket exhaust and air filter with a modified airbox lid on the stock sprockets.
The greatest trait of this bike is that it is cheap to own. When you compare prices to the 450’s, it is considerably cheaper to buy! The only thing you are missing out on is the power of a 450, but everything else is there as it handles just as well as any 450 (Doug Gust proved this a while back with a DOMINATING race season back in what I think was 2004 or 2005.). However, the KFX has a far better seat, so its a good tradeoff in my opinion as I doubt there is more than 20% of KFX400 owners/future owners who will use the machine for competition racing. Also, as a plus, parts are fairly cheap including the aftermarket. That is, so long as you search a few websites for the best deals. Ebay is usually a good bet.
As for reliability, mine has been great to me for the last 3 years. I am not a hard and aggressive rider, but my KFX400 hasn’t been given an easy time by me either. I am in the middle somewhere. The machine hasn’t needed any major work with no parts pre-maturely breaking or wearing out fast.
So all things considered, this is probably one of the most cost-effective machines out there for the everyday rider who likes to have fun on any level.