mini bikes!! what are you running??

I know this isnt really a hamb question, but I found a 60's mini frame for pretty cheap, and want to build one for the kids, and my own personal fun, of course. I was wondering what I should use in this thing. I know we all love to see the mini races, so I'm hoping to get some good info before they shut this thread down!

 

here's the Hamb version of the mini bike forum...http://66.154.44.164/forum/group.php?groupid=161


and here is a non Hamb forum, these guys are pretty good over herehttp://www.oldminibikes.com/forum/what/?daysprune=-1&order=asc&sort=postusername

 

i ran a 5 horse honda in the one i had as a kid.

 

Here's the HAMB minibike discussion thread: http://www.jalopyjournal.com/forum/showthread.php?t=119200