I just took out my recently purchased 1972 Evinrude 9.5 hp. IT cranked up after a few tries, and at full throttle ran fine for about 30 minutes. Then, all of a sudden, it started slowing way down and it felt like it was at idle speed. After that it died, and yes, i had the gas tank vented. I pulled on the starter and it fired right up and ran fine after that. Does anyone know what the problem might be? Should I have adjusted the Rich-Lean screw? Thanks
