2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 69Get this manual
INSTALLATION AND PREDELIVERY FINAL ADJUSTMENTS
Dual-Outboard Alignment
Dual outboards must be connected with tie bar and adjusted to align the outboards for correct water flow to the gearcases and propellersIncorrect outboard alignment could cause one or more of the following: Propeller ventilation Reduction of top speed Improper boat tracking Engine overheat and powerhead damage Follow the instructions provided by the tie bar manufacturer for tie bar installation and adjustment
Alignment Adjustment