Lately I have noticed a whistling noise coming from my motor at low speeds (around 2000 RPMs). When I throttle down the noise goes away. Does anyone have an idea on what might be causing this? It is also idling a little rougher than before. I recently installed a slightly larger prop. Went from a 10 3/8 X 12 to a 11.375 X 12. This is the only thing I have done differently. Could this be part of the problem? Any help appreciated! Thank, LC
