Thanks for the help! Nice idea max, that would be pretty funny! This is going to be strictly off-road as I am due to have my driving license taken off me on tuesday due to getting breathalised the morning after and failing. Gutted. Anyhow, live and work on a farm and thought this would be the best way to get around as there are some roads to cross which i could just push the bike over a bit less conspicuously than a motorbike. Apparently I would have to get road tax to even push a motorbike across the road. I don't want to risk anymore run-ins with the law!
The seller linked me to the ebay seller who the engine came off:
4 stroke Motorized Bicycle Engine Kit Gas BIKE 49CC YXM on eBay (end time 21-Mar-10 10:06:29 GMT)
And here is the engine model I reckon it is!
Yong Xing Machine Manufacture Co. Ltd.
How trustworthy are these YXM engines? Any advice appreciated, thanks.