Moped Army

Was doing research on this gear reduction thing that you speak of...I don't know if you can see in this picture how I got the sprocket on the motor but what I did was to take the original sprocket that came with the motor off. Weld that to a large flat washer and then weld a 14t sprocket to the washer. I added a few filler welds for extra strength. Because I used the original sprocket all I had to do was bolt the whole assembly to the motor. Since we're talking welding, angle grinders work good for cleaning up the welds and to expose any gaps in the bead.

As far as motor placement, it is sitting right in front of the back tire, I'm 5'8" and have plenty of clearance while peddling.