Ok heres what I have, I have a 2000 115 yamaha 2 stroke that will not run at idle. The boat was on a lift in central florida and I was unable to get it off because of water levels. I ran the boat every other week if not weekly for about 6 or 7 months. This past weekend I let it run and took it off the lift (the water finally came up enough). It ran fine for about 20 minutes at idle and wide open (pulling a tube). When I slowed down to get people off the tube it shut down. I got it running again and was able to use it at about 1/2 to full throttle and it ran fine. I had stabil/ethanol treatment in it while it sat, checked the tank vent, and also replaced checked both filters (10 micron engine mount and fuel water filter replaced). I dont know where to check next, I am thinking it possible is the fuel pump because with higher rpms it pulls its own vaccum through the pump but will not at lower rpms. If this is not it I am guessing maybe I picked something up in the carbs but for both of them to get jammed up at the same time seems weird. I am just looking for some advice from maybe someone that has seen this problem or knows which way to point me. Like I said its a 115 yamaha 2 stroke, oil injected with unknown hours (approx 300) and used often when the water levels were normal.
Much appreciated.
Much appreciated.