In 1955 I got a Doodlebug rolling frame minibike and got it going.

Recently another one turned up not so complete and I'm
working on it. Here are some patents that relate to Doodlebugs.
I'm trying to reverse engineer missing parts from these drawings.

http://www.google.com/patents?id=7RZ...erview_r&cad=0

http://www.google.com/patents?id=7RZ...erview_r&cad=0

http://www.google.com/patents?id=4lt...erview_r&cad=0

http://www.google.com/patents?id=41t...erview_r&cad=0

http://www.google.com/patents?id=Hed...erview_r&cad=0

http://www.google.com/patents?id=xot...erview_r&cad=0

Does anyone know the diameter of the large pulley?

Folks here seem to know about everything.

Best regards, Charlie