check out this 1936 MotorBike Patent!

[bairdco]

found this thanks to a post on the cabe (Silver King Motorized Bike Patent)

MOTOR BICYCLE - Google Patent Search

really cool engine mounting method...

if you've got some time to kill, do a search for "motorized bicycle" at Google patents. (also, "motor bicycle" etc, you get the picture.)
there's tons of cool ideas, drawings, and things you thought you invented, but someone else came up with a hundred years ago...

 

[WayneC]

It's always the way. I had this cool idea for a flying machine once that people could actually ride
in! Seems like all the cool things have already been done.

I always feel like I was born 100 years too late.

 

[wheelbender6]

I like that design because the engine can be mounted very low without pedal interference.
Beautiful drafting.

 

[weekend-fun]

first motorized streach cruiser?

 

[RebelHellbilly]

i like the look