I remember seeing at least one thread here about a Yanmar diesel in a 23 CC IB being run in the NE somewhere - I'm thinking it was a 6 but might have been a 4. IIRC, it had great performance...
Also, I know Metan did a jackshaft I/O Yanmar conversion (on Youtube) and maybe an IB Yanmar - reach out to them and see what they can tell you.
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