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 



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.

I cant wait till i get it its so kool i cant wait to rip it up on my street and the forest!

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