Originally Posted by boostingmorale
Brand new to forum
I have a 2007 m 3 g r
I bought a short shaft 15 inch 50hp tohatsu
Is it the correct motor ? I am.getting a banana shape in the boat when try to plane
What pressure should i fill it to ? What trim angle shoulf i have ??
Cant find specs on my exact model but some outboard shop sized it up and yold me it was a short shaft model
The cavitation plate should be approximately 25mm / 1 inch below the the middle low point of the transom.
The correct pressure for the boat when operating is 240 millibar / 3.48 psi. Be sure to check the pressure after the boat has been in the water for a few minutes, as the cooler water will alter drop the tube pressure.
Your "crumpling" problem is caused by a lack of tube pressure or an improperly installed floor.
Just a heads up, it is VERY tough to inflate the boat properly with a footpump. I would recommend purchasing a small 12v electric pump.