Re: Aqua International BikeBug friction drive wheel??
You can with a little care make your own re-build kit. Also, there is a check valve that gets stuck from crud ect. check that. The felt tipped filter inside the tank at the end of the fuel line gets clogged very easily and will cause those symptoms as well. Check or replace it.
You can use a skateboard wheel as a replacement, just pull off the old drive roller, measure it and get a wheel of slightly larger diameter. Don't use the bearings of course.