Outboard Engine Rebuilding & Machine Shop Service - 1989 Yamaha 70hp runs then dies

It runs well for a few minutes then starts to bog down and eventually die out. I thought it was a fuel issue so I rebuilt all 3 carbs, cleaned out fuel tank, and fuel filters. That didn't work. I got totally separate 6 gallon tempo tank with new line just to rule out the original fuel supply. No luck.

After it dies and I let it sit 10 minutes or so it will restart and run well until it then starts to bog down and die out again. If I start it right away after it dies it runs rough and dies very quick.

I'm ready to start replacing parts one at time, please help me not be a dumb ass...

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sounds like fuel starvation check the fuel pump diaphram take it for a run using the hand primer to pull the fuel up see if it runs any longer also check the vent hole in the tank also check the fuel line connector to the engine just might be sucking air ?

BigMike try getting a spray bottle with gasoline. once the motor sounds like its about to die out spray some gas into the throat of the carbs if it picks up you have gas problem. If that does not work give us a call we will guide you through the process of effectively trouble shooting the electrical components