I have a 1970 115hp evinrude that loses spark after it warms up. the motor is not overheating because you can hold your hand on the cylinders when it quits. it will restart after it has cooled aprox. 15 min. I have changed the coil,ign.saftey circuit,rebuilt carbs. I brought the boat to a guy that works on older outboards who was referred to me by several marinas. He did a complete ign. test and everything checked out ok. but he could not make the engine quit in the test tank, i dont think there is enough of a load to make it quit running in the tank. he told me he thought it was a fuel problem ,he reset the carbs and cleaned the tank vent and told me to try it. I did, same problem.I dont want to buy more expensive parts that i dont know will fix it and i can't seem to find anybody that can find the problem. any help would be great,I am about ready to pull the plug and swim to shore.
