Having a clear out and found a go cart I was building for my son, hes 15 now and outgrown it :o....built using a ransoms lawn mower engine of approximately 90/100 cc with centrifugal clutch, one speed no gearbox, cable operated disc brake, suitable for ages 8-12 ish, could be used as is or strip down and paint/fettle...great father/mother son/daughter project.....can deliver for cost of fuel or free if local.....open to offers before it goes on ebay tonight.....get the kids off the play station x box and onto a proper toy 
One, is never going to be enough.....