Just thought you might want to know this. I found 3" wheel spacers on Ebay that will work on a ATC70. The spacers are for a KFX50 (kids quad). I believe they are 8mm X 1.25 threads. The spacers are the thread on type and give you 1 1/2" inches of clearance per side. It is just enough to the kickstart if you haven't converted your CDI motor to a pull start. Just thought it might be helpful for some people.
Here is the link.
eBay Motors: 3" ATV Wheel Spacers Kawasaki KFX50 KFX 50 (item 330299682435 end time Feb-08-09 08:40:44 PST)