If it was a Merc, I'd say a 17" or 19" pitch. I don't know what's right for a Yami, but someone will chime in.
But first, check to see if your prop has a removable hub. If so, you can buy one and replace it yourself. If not, call a prop shop and ask what they would charge to re-hub it.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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