Originally Posted by Phil Chitty
She goes just fine.
I've not seen a 550 with any more than a 115 on the back. Originally Galaxsea had a 115 optimax on the back. I had this changed for a 4-stroke before I bought her. Its a good solid engine and quite economical.
In Oz the 550 is rated to 140HP, but only rated to carry 10 people. I think elsewhere due to different regulations it's often rated to only 115 hp but to carry 11 people. Go figure.
Most likely it is due to the extra weight they allow for the engine during the test. The 135 is a heavy motor really, as it's the same block as the evinrude 175 motor and comes in at the same weight