I saw a motorised pushbike from rocksolidengines.com.au today. Surprising to see it at the Ballarat Maxifoods. I was impressed at the build quality. Checking their website I was impressed by their price.
I think i still prefer electric though. The potential for stand alone solar power is very attractive. And these suckers do seem very noisy.
It makes me want to get my act together and rebuild my Aprilia Enjoy.