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Motor mount

aaa1950 Member Posts: 19
i am new to the boating world.  I have a 2012 Sundeck Sport with a 115hp Yamaha OB.  I have read somewhere that this engine should be mounted in the second hole for this boat.  Does anyone know for sure how the motor should be mounted and how you determine which hole is the second, from bottom to top or top to bottom?  Mine is mounted in the top hole (of 4 holes) but it looks like the motor was mounted in the second hole from the bottom at some time, unless the markings are from where it was mounted in a shipping crate.


  • Ernest_T
    Ernest_T Member, Moderator Posts: 269 ✭✭✭
    Generally you want to start with the anti-cavitation plate on the outboard at the level of the bottom of the boat or just slightly higher (1-3 inches): [link=]http://www.yamaha-motor.c...s_log_vol_1_no_14.aspx[/link] The best guide to whether the motor is mounted correctly is how it performs. You should have an idea if your motor is mounted too low or too high as you trim it. If you can trim the motor all the way up without getting any ventilation when you are running fast then you may be able to move the motor up another hole. Ventilation is pretty easy to hear when you are running, and you will see a jump in the rpms. If your prop begins to ventilate before you even reach 1/2 trim then it may be mounted too high. Basically, you want the motor at a height that gives you maximum rpms without ventilation as it reaches the upper area of the trim adjustment.
    2010 Hurricane 2100 (217) Sun Deck
    2008 Yamaha F150 TXR Outboard
    2008 Yamaha FX **** Cruiser Waverunner