I just put my 2016 F90 Yamaha outboard on the back of the Grew 194 I/O converion I'm working on. Man that motor looks big and heavy back there! I hope she isn't too heavy on the back end or too top heavy. The old L6 165 i took out weighed more but also sat lower and further ahead. I guess time will tell, but I'll definetly be trying her out in the nearby small lake before puting her in salt water.