Used to evinrude now I have moved to opti. It is a standard opti. No idea on prop shaft diameter currently have. Standard lower unit. I have searched everywhere no site give that info.
That seems to be the driving factor. I just purchased this motor. Thanks
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1" likely (4 strokes are 1.25)
https://www.bbcboards.net/forumdisplay.php?f=8
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