Originally Posted by lightning
I've got a Zodiac 285s SIB and Mariner 6hp engine. The instructions for the engine state that the anti-ventilation plate should be 1-2 inches below the bottom of the boat. on my boat it's just under 3 inches...is it worth fitting a spacer to raise the engine an inch or will it make no difference?
If your zodiac has 40 cm measured from upper transom to sib's bottom transom will be ok if using Mercury/Mariner/Nissan/Tohatsu engines, if not, under 39.5 -38 cm, might experiment water splashing inside sib, correct heights parameters improves performance with less water drag/splash issues on tail.