How do I mount a weed wacker motor to my bike?

I would start by doing some measuring, then fabricate yourself a mounting plate, and weld it onto the frame of the bike. Then mount engine and then you have to get your sprockets and chain matching and aligned.

If it interests you, I remember seeing a weed waker mounted to a remote control toy car on the internet. You might consider looking that up. It looked pretty cool.

Did you get it mounted yet?