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The way to determine if you have the correct prop is to check your WOT (wide open throttle) rpm. It sounds like you may have a Yanmar 3GM, I think the WOT is supposed to be 3600 (check your maunual). Your engine should reach the WOT in forward but not much higher. If it goes above that rpm, you are underpitched, if it won't rev up that high you are overpitched (or the bottom is fouled, prop covered in barnacles, etc.) and you lugging your engine all the time.
John
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John Davidson SV Laurie Anne
1988 Brewer 40 Pilothouse
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