C.U. Fishin
Well-known member
I have a 1971 Evinrude 25hp mounted on a 14' semi-V with wood decks and floors, it also has a trolling motor and battery. I would guess the total weight of the boat loaded to be @550lbs. With 2 people in the boat I'm getting maybe 18-20mph speeds. It seems like it accelerates slowly and even at top speed it sounds like the motor isn't running enough RPM's. Both cylinders are getting spark and based on the appearance of the plugs after running a new set and pulling them after that both cylinders are firing.
My thought is that I may need to step down the prop pitch for better performance, is there any reliable method of determining the approximate engine speed without investing in a tach that I have nowhere to mount permanently on the boat?
Are there any pitfalls to trying out a lower pitch prop other than being careful not to over-rev the motor?
My thought is that I may need to step down the prop pitch for better performance, is there any reliable method of determining the approximate engine speed without investing in a tach that I have nowhere to mount permanently on the boat?
Are there any pitfalls to trying out a lower pitch prop other than being careful not to over-rev the motor?