I haven't read any reports about the new Kawasaki 4 wheeler (4 wheels are for those who can't ride a two wheeler [X]), however, a quick glance at the Suzuki web site has Suzuki saying that the motor is based on the RD-400E engine.
Oh, you didn't know that Kawasaki and Suzuki have formed a "stratigic partnership" on certain models of bikes and ATV's. They are keeping the big boys out of the picture (ZX series and GSXR series will be seperate as will the big bore cruisers, motocross bikes and the land yachts), the partnership applies to the smaller series of dirt bikes, smaller cruisers, and ATV's.
Look at the line-up of both manufacturers before you go buying. The Suzuki Suzuki QuadSport Z400 and the Kawasaki KFX400 are the same ATV.
[img]http://www.suzukicycles.com/sr_03/atv/images/bp_ltz400_yellow.jpg[/img]
[img]http://www.vaq34.com/junk/kawa.jpg[/img]
Why bother, why not get the baddest one around, the Yamaha 660 Raptor!
[img]http://www.yamaha-motor.com/products/atv/500/660RAPTOR_le_2.jpg[/img]
Or how about the fastest one!
[img]http://www.yamaha-motor.com/products/atv/500/03BANSHEE_LE_2.jpg[/img]
DooH, you already have a Banshee. Why change?