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Can anyone shed some light, I have a 60 yammie 4 stroke and changed the prop on it to what was recommended,it's the same size and pitch as what was on there, just better condition, and now it seems to get the same speed out of it but the rpm has dropped to 4900 it was windy and choppy when we were out though and I have just fixed the speedo on it aswel would this cause it to read different maybe? It has the tube speedo thingy. TIA