I once got a bicycle to do 15 mph with the Ryobe using a rather unorthodox (my middle name) drive system. Someday I'll re-assemble it and post some pics.i found a 31cc RYOBE weedeater not vary big but if i can get it at 1000rpm with me on it the speed calculatar sais that is will go 9mph
I'll give you a hint. In my research, I discovered that this was first attempted in 1911 with a multi-cylinder engine. Stay tuned...I smell a new thread in the coming weeks.Can you describe the system briefly?