How to Align a Twin Yamaha Outboard

Written by luke kim
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How to Align a Twin Yamaha Outboard
Proper allignment of twin outboards will result in proper propulsion. (Jupiterimages/ Images)

Installing twin outboards is not as simple as installing a single outboard. Installing single outboards would require only one calculation regarding the angle of the transom to determine what the most efficient propulsion would be. Installing two outboards requires the same calculation with an addition of alignment and spacing so that your boat does not spiral out of control. The process is simple with some concentration and will require no more than an hour at most.

Skill level:

Things you need

  • Twin Yamaha outboards
  • Wrench
  • Tape measure

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  1. 1

    Calculate how far apart the outboards would need to be from the centerline. Call Yamaha customer support for the proper spacing information. Leave 22-inches between 2 to 3 cylinder outboards. Leave 26-inches between V4 and V6 outboards. Leave 27-inches between V6 four-stroke outboards.

  2. 2

    Bolt your outboards to the proper places on your engine bracket at the back of your boat, according to the spacing recommendations of the American Boat and Yacht Council with your wrench.

  3. 3

    Use the tape measure to measure the distance from the tip of your driveshaft of one outboard to the other. Use the tape measure to measure the distance 10 inches from the tip of the driveshaft to the same point on the other driveshaft. Lower the angle on the second outboard if the first measurement is longer than the second. Raise the angle on the second outboard if the second measurement is longer than the first. Repeat this Step until the distances are equal to each other. Secure the outboards with the wrench to prevent changes in angle.

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