is a combination of possible items....#1...cutlass bearing ,,when last replaced? #2 engine bed bolts or fasteners are they all tight ? even best of them can work lose ...especially front port bolt seems to be a favorite #3..folding prop blades get sloppyprop shop can re align or repitch as need be...# 4alignment of engine to shaft #5 the shaft it self.... all of these items best checked when on the hard..its amazing what improvements when done...went from some what noisy deisel to an engine purrs like a cat & hardly noticeable
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