2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 47Get this manual
INSTALLATION AND PREDELIVERY OUTBOARD INSTALLATION Transom Brackets and Jack Plates When mounting an outboard on boats equipped with transom brackets or jack plates, refer to the manufacturer's recommendations Confirm maximum weight and horsepower capacities Jack plate assemblies must provide one-piece mounting surface to support the outboard, hydraulic unit, and steering system
Transom Measuring and Drilling
Hull Centerline
Locate the centerline of the boat transom as it relates to the hull (bottom) of the boatUse straightedge to draw line connecting the port and starboard chinesThe chines should be used as reference points for determining the centerline of the hullUse framing square to accurately place line on the transomThe centerline of the hull should be in line with the keel of the hull and perpendicular to the midpoint of the line connecting the port and starboard chines
Mounting Hardware WARNING