Have just recently set up my crf88 pit bike with Rox billet Alluminum 5" risers.
I have also a T2 bar mounted on top. I no longer hit my knees on the BMX bars it a sweet set up. Thought I would suggest it to mini riders.
Go to www.roxspeedfx.com it is a really cool site expecially for quads!
CHECK IT OUT!!!