Evinrude 35HP 1981 on a 10 Foot Rib Inflatable Boat Test after Service

I have a Great Running Evinrude 35HP SS on a Walker Bay Rib Inflatable 10Foot I have 2 batteries in the front as well as the gas tank because the boat is too light at 125lbs rated for a 15hp but solid aluminum transom best i have seen for small Ribs. This one feels fast I wish I had an accurate gps.