what can you use for a bike engine cheaply or stuff that is laying around the house?

I would like to attach a engine to my bike so i dont half to pettal as much but still have the option to i wont to go fast and it go fast and strong and a gas engine so can someone help me

Re-design5 years ago
Always go downhill. That's very cheap.
jbaker225 years ago
Check Craigslist of a close city for a self propel mower. Chain saws have a centrifugal clutch( you won't need to use a clutch like a stick shift car.) there are engines under $10 sometimes.
iceng5 years ago
Here is an electric version.
A adapt a lawn mower, chainsaw, weed whacker or some other gas powered tool's engine to run the bike.

There are all sorts of instructables covering this topic.