Steve hills
New member
I have twin Perkins 6354 in my boat and one engine is surging in rpm. The first time it did this it was only once in a three hour trip. Next three hour trip it did it several times . On my last trip it has increased to every 10 minutes on the way out, and on the 5 hour trip it was every 3 minutes. It does not seem to matter what rpm I am at, it still revs up about 120 rpm. And I do not think it is the transmission slipping as I am quite sure I feel the boat speed up just a little. Does anyone have any ideas on this?