Re: installing motor mount bolts?
It is also very important that you drill perpendicular to the transom. I turned a piece of one inch aluminum bar stock to be a snug fir in the motor mounting holes and drilled it on the lathe for a 1/4 inch pilot hole. With the motor in place, insert drill jig and drill pilot hole followed by appropriate finished drill size. I think for the Merc they recommend a 9/16 hole. I used 5200 in holes and on bolts.
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