I found 5 old Ryobi whipper snippers that people threw out in hard rubbish:
1X 26cc no clutch
1X 31cc no clutch
3X 31cc with clutch
I have taken them all apart to clean/fix them and so far i have 3 of them running. The other 2 need fuel line and they should work as well.
I have 2 old bikes that i could use to make them motorized. I am going to use a chain to power the rear wheel.