So, In april 2009 we bought a used KLX110 mini to tool around in the backyard and weekend trips at Metcalf, Hollister, etc. Currently the motor is stock, except for the manual clutch. The suspension is only mildly modified: bbr fork rods and stiffer springs, and a works shock in the rear. There's a few other minor mods like Tag bars, ASV levers, over-the-pegs brake lever, BBR kick starter, and Two Brothers pegs and pegmount.
Here's some pics of the "first ride".

Note the no helmet in this picture (kids don't try this at home -- professional rider on closed course)... rest assured helmets are worn around here.