It sounds like you have an aftermarket petcock on the bike. I am not familiar with a Harley petcock that has a round knob but then maybe just the knob is an add-on. In 1996, Harley went to a vacuum operated petcock, one that gives lots of problems. I cannot tell you which way is reserve on your petcock. The only way to tell for sure is to pull the petcock out. You'll see a plastic strainer on top of the petcock. Inside the strainer, there is a tube that runs approximately half way up the strainer. Select a position on the petcock valve and blow through the petcock. When you feel the air come out of this tube, this is the "ON" postilion. Right beside this tube inside the strainer is another hole directly into the petcock. Find the position that allows for air to pass through this hole and you've found the "reserve" position. The remaining position should be "off".
Good Luck
Steve
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