2006 Kawasaki KFX 400

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.

Kawasaki KFX 400

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

  • Engine: Liquid-cooled, four-stroke, single cylinder with DOHC and four-valves
  • Displacement: 398cc
  • Carburetion: Mikuni BSR37
  • Starting: Electric
  • Transmission: Five-speed-plus-reverse manual, multi-plate wet clutch
  • Final drive: #520 O-ring chain
  • Frame type: High-tensile tubular steel alloy
  • Front suspension / wheel travel: Dual A-arms with coil-over-shock, adjustable preload / 8.3 in.
  • Rear suspension / wheel travel: Swingarm with preload-adjustable shock / 9.1 in.
  • Front tires: 22x7-10 radial
  • Rear tires: 20x10-9 radial
  • Front brakes / rear brake: Dual hydraulic discus / Disc
  • Overall length: 72.0 in.
  • Overall width: 45.9 in.
  • Wheelbase: 49.0 in.
  • Ground clearance: 10.4 in.
  • Lighting: Dual 30W halogen
  • Dry weight: 373 lbs.
  • Fuel capacity: 2.6 gal.
  • Footpegs: Serrated steel
  • Colors: Kawasaki Lime Green, Blazing Orange


  • High-performance four-stroke engine delivers exceptionally broad torque curve for maximum traction for a variety of sport-riding conditions
  • Twin air intakes on the front fenders provide extra cooling to the radiator
  • Dry-sump lubrication allows the engine to be kept low in the chassis for superior weight distribution and handling while providing higher ground clearance
  • 37mm carburetor increases engine performance
  • Electric start makes getting started easy
  • Five-speed manual transmission helps the rider keep the engine in the powerband
  • Reverse gear makes backing up convenient and easy
  • Efficient chain final drive provides maximum power to the rear wheel
  • Swingarm utilizes eccentric chain adjusters, making chain adjustment easier
  • Dual A-arm front suspension and rear swingarm help to soak up the bumps and jumps
  • Front shocks feature fully adjustable compression and rebound damping as well as adjustable preload for multiple suspension tuning options
  • Triple disc brakes provide exceptional stopping power
  • Dual halogen headlights brighten the path for nighttime riding
  • Serrated steel footpegs help to keep the rider’s feet from slipping in wet or muddy riding conditions 


Yea I just bought a 2006 KFX 400 and when I have the gas tap in the "on" position the bike will run for a while and then cut off. However, if I ride in the "prime" position the bike runs like a champ. Can anyone help me with this problem?

i have a 06 kfx400 and i love it to death. but last weekend at the drag strip i came into contact with a non racer that felt the need to cross the drag strip. i now have a kfx400 with i bent frame. i have a neighbor with a 03 kfx400 with a blown engine. will the 03 frame work with the rest of my 06 setup????

i own a ltz 400 and one thing you need to know about the ltz/kfx/dvx is you will need to change the timing chain yearly if you ride it alot mine recently blown up for sum unknown reason that was not a factory problem and if u have problems like this you can replace the top end with an athena top end for 550$ wick is much cheaper than oem i also had to replace my crank so i bought a hot rods crank that saved me like 200 over oem you will love the bike it only has the thing with the timing chain to wory about and carefull tighting your oil tank drain plug

man i own a yfz 450 and my friend has an 06 kfx400 and i own him in a race i mean by more then enough mine is quite a bit faster. the only race a kfx stock could beat a stock yfz is in reverse and only because yfz do not have reverse

yeah i have a 2006 kfx400 and i love the thing i has so much power i can hardly belive it i had a 2001 400ex before but thats a childs toy after ridinf the kfx i would recommend this bike to anyone who is looking to buy one it is really fast to i got her doing 139 kph the other day and i compelety blew past my buddy who was on his 2004 raptor660 liked he was tied onso who ever who want to buy one do so really good bike to ride.

I just recently bought my 2006 kfx about a month ago and i have nothin bad to say about it my buddies all like honda’s and they didnt like my bike when i first got it then i raced my buddy with 400ex with an fmf pipe,carb,air filter.. and i absolutelyblew past him by 5 or 6 quad lenths .. the bike is really good in trails,water,mud.sand, anything it handles liek a dream and gives the best ride.. wheelies.. they come up like nothin even 2nd and 3rd gear .. i recomend this bike to anyone who is lookin to buy a 400 its alright for beginers east to ride and its awsome for intermidiate .. i take it on the track is has no problem keepin up with 660’s they only beat me buy a little bit... deff a good investment ...... good job kawasaki!!!

i have a kfx 400 with a 440 kit and about another 2,500 in to the motor it is really fast i went 83 mph on it the other day down a paved road with my friend on the back it can high 90 mph with just me on it but i also have a rev limiter so if i didnt have that i could go even faster prolly another 5 mph i lov my quad it is so awsome and it handles well in the air

I have a 04 orange one, sooped up. Its pretty fast. They go around 69 to 73 mph depending on the bike setup. I like mine and i can get wheelies in every gear and ride them for ever. But its a lie if you say it can beat a 450, maybe if it was bored out.

My 06 kfx 400 is a sweet bike, it handles any trail out there but I can’t seem to keep it running. This will be its second trip to the shop in 2 months. It dies when I slow down from high speeds, leaks oil, and it seems to burn oil when running. I would suggest an extended warrantee when you buy it, and compared to the trx 450 it stands it’s ground.
Maybe i got a lemon

I have a 03 kfx 400 and i really love it.the power is awsome,all you need to do is add a pipe and header and jet the carb to the pipe spec. and you are ready to really rip it up.I ride mx with trx450’s and yfz’450 and have no problems with them.Would suggest one to anyone looking for a good sport quad!


I just got an ’03 kfx 400 two weeks ago, Saturday was the first time I got to really ride it. I thought I might have paid a bit too much for it but I was limited in my options since i wanted a sport 400 with reverse, but I must admit it has some serious balls. I believe now I can smoke my buddy with his 400 EX. And after my first ride ended fairly early with a 40 MPH barrell roll, while wheelieing across a water crossing, and a few bruised ribs, I gotta say it does command respect. Even after the crash, in which I travel some 20 yards and the KFX went another 20 yards, it only cost me an $8 tie rod, and I still rode it out of the woods. I tweaked the handle bars back in place and she’s ready to hit the trail (even if I’m not). After only one ride I would highly recommend one, it has a smooth delivery of power, comfy ride and is very stable one hills and jumps. 1st class ride.

I hae a kfx 400 stock and I beat yamaha 450s. not much but I do like a half of a 4 wheeler and it has reverse. u can’t beat that. U see doug gust kick the 450s a**

What is the top speed for the kfx 400??

i am getting one this week smiley

I think I’m gonna get one. What is it’s maximum speed?
e-mail me

I love my KFX 400. Its an intense ride.... the honda 400 trx does not even come close to comparing to KFX.... the honda 400 is too slow. haha. The first day I bought it I was made fun of by a friend of mine cuz he is an intense honda enthusiast. I was able to change his opinion about it when I let him ride my bike. Now he wants to buy the bike off of me. It does get attention from onlookers. I think it’s because the GREEN is soo gorgeous. haha. I would recommend this bike 100 percent. booyah

i am going to kick your aron marsh.

i am getting a kfx 400 and it is going to kick ass

I have owned a kfx400 for about a year now, and to this day it still amazes me as well as fellow riders, this bike is not comparable to the honda 400, it is closer compared to the TRX450, in my area the Kawasaki hasnt been a popular choice until recently, people are realizing that the kawisaki quads are amazing and overall dont have any common problems, unlike the hondas.
Many of my freinds are considering an investment in the kawisaki KFX 400, and i back them completely. This is a fun overall quad to ride, ive been to the dunes, ive climbed hills, ran the local MX tracks, ive even raced through trails in all conditions. This bike is Fast no matter how you look at it, and it handles tighter and smoother than most other stock bikes ive rode as well as a few MODDED bikes too.
And Problems, what problems, in the 10 months ive own this bike ive changed the oil 3 times now, and cleaned the filter 4 times, and thats the extent of the work ive had to do, it has always started right up, it has allways ran to its full potential. Mechanically this bike is sound, and still looks great.
I would have to say this is still my bike of choice, and if your considering to buy a KFX400 i hope you consider my opinion. HAPPY TRAILS.

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