Is this is on your 1964 Fl as in your name & bike. If it is then with a speed-o drive off the tranny it is a 1:1, if off the front wheel then it is a 2:1. You can get a 2:1 speed-o by changing the drive unit in the tranny to a different gear #. I think they were 23 tooth for 1:1, and 11 tooth for 2:1. If my memory is still active.
tourbox