Message 2 of 2
Posted by member Richard Moynan on Sunday 15 May 2022

As I understand it, the Fishing 20 was designed for two 40 hp two stroke engines. This is why the transom is wider on the Fishers than on the Pilots to accommodate two engines side by side. Two stroke engines are lighter than four strokes of the same power. We have a Fisher which we re-engined a few years ago with a new four stroke and were advised that a single 80 hp was probably the sensible maximum option. Remember the transom has to be strong enough to carry the weight of the engine and the thrust produced by the engine of choice. A larger engine will put more stress on the transom and structure of the boat.
Our 80 hp will get her on the plane and achieve up to about 20 knots. We have trim tabs and some extra weight in the chain locker in the bow to balance the heavier engine. There are a number of Fishers with bigger engines which have proved to be ok so far, but some insurers, I believe, regard 80 hp to be the max design power, and you may have difficulty from them.
Your 100 hp engine will be heavier than two old two strokes and will obviously produce more power and stress on the structure of your boat. It may be perfectly ok , they are well built, strong boats, but I am not qualified to say for sure. Nobody else seems to have posted so I hope this is helpful .

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