I have a 1946 Norwegian inboard boat with a Swedish 2-cylinder, 6 hp inboard engine. The engine was replaced in 1993 with a new engine that’s essentially the same design as the original from 1946. Last summer I had increasing trouble with the engine, starting with it needing more choke than normal to keep from stalling at idle. By the end of the summer, as I was cruising in to my marina (at her normal, brisk 3 kt cruising speed), the engine started needing more and more choke to keep running. Also whenever we encountered any wake that caused significant side-to-side rocking, the engine would sputter and almost stall.
My mechanic thinks the carburetor needs to be rebuilt or replaced, but I have trouble believing an engine that only has a maximum of 400 hours running time would need that (and it looks like it would cost at least $1000).
Anyone have any better ideas?