RE: converting a weedeater/chainsaw motor
There is a member here on this section by the name of [link=http://www.rcuniverse.com/community/profile.cfm?section=profile&forum=1&memid=211422]Lester Burch[/link]....get ahold of him.
He can make a prop adapter and engine mounts for you....otherwise its MacGyver time. Most people just scratch a patch of hair off their head before a good mounting idea takes hold. LOL
If you cant figure anything out, post up a pic and we can try to help as much as possible.