So I just bought a 2006 Kawasaki KFX400, really like the quad, feels alot quicker than my 400ex I used to have. Mine has a jetted carb, and has a 434 kit. And a yoshimura slip on exhaust. Anyone know what the top speed might be? Don't have anywhere around here to open it up. Just figured yall might know.

 

Stock, mid 60's. Modded, upper 60's. maybe low 70's. Unless you've changed any of the sprockets, it's not going to be much faster with the kit. A whole lot quicker getting there though.