Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 43Get this manual
Installing Outboard Drilling Outboard Mounting Holes
1Attach (tape) engine mounting template (located with the installation manual) to boat transom
Securing Outboard To Boat Transom
1Refer to "Determining Recommended Outboard Motor Mounting Height", preceding and Install outboard to the nearest recommended mounting height2Fasten outboard with provided mounting hardware shown
IMPORTANT: If using "Transom Drilling Fixture" (part number 91-98234A2), use drill guide holes marked "A" when drilling outboard mounting holes