So I went out and was unable to get my Yamaha 70 2 stroke started. I played around with it and ended up pulling the carbs, they were filled with goop. I think I got some bad gasoline, or just a lot of water in in my tank. I usually start my boat once a week and have never had problems with it before. Well I have cleaned them out thoroughly and replaced the seals and the metering pins. Do you guys know any products I could soke them in to dissolve any gunk I can't get to? Also I talked to the owner of a marina here in town and he told me I have to replace all three carbs because once this happens it will continue to happen again in short period of time. To replace all three carbs would cost about 950.00 after tax . What are your opinions? Personally I don't think its worth it especially on a 6 year old motor. I figure I will just pull them every six months or so and clean them out again. Am I being naive?