hmmm, well i may as well pick yalls brain n try here. I have a 60's model 9.5 evinrude. Ive had 2 different marine repair places tell me there aint nothin wrong with it, but I take it out on my boat and it quits after about 20 minutes great running. the last repair shop i took it to ran it for quite a while in their tank, cleaned the carb jets and said it was fine. they even put it on a 16ft bay boat and ran it all over the lake on their gas tank and mine. i thought it was fixed, but i take it to the river and it runs great for about 20 minutes and quits. i pull and pull on the rope and it might start, but wont keep runnin. sometimes acts like its flooded, sometimes like its starvin fer gas. its a shame cause when runnin this lil 9.5 will make my 14ft jonboat plane the water with about 600 pounds of weight in it.