Cannabalizing a Stihl Weedeater

With the onset of summer I recently have been doing lots of work in the yard, trying to tame the grass and such. As I fired up my Stihl weedeater and felt the metal tube shaking from the spinning shaft underneath, I had a strange idea pop into my head... Would it be possible to cut the shaft in half, make a crude differential, weld them together and build a very small gasoline/oil powered car? Of course it would have barely any power, but maybe you could control it from your phone and get together with your buddies and race them down a street.... Seems like a fun project if you've got the skills, materials, money and the heart to destroy a nice new weedeater.

...Get together with your buddies and race them down a street...