Had same problem with a DF60
It ended up being a small hole corroded in the head around one of the cylinders, I was lucky, a good head shop was able to fill it in.
With the manual it was really easy to tear the motor down, I had run into the same issue with marina's and mechanics.. Not to mention their estimates where in the $2000.00 range, it ended up costing my less then $300.00 plus about 5 hours labor.
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