I have read on other boards and this one that Sea Foam is the end all (Jesus in a bottle). Well last night I bought a can and did a de-carb, figured it would not hurt. Here is what I did warmed motor up, then sprayed a half can through each carb till almost empty, then I shut her off sprayed a little in each cylinder and waited about 10 minutes. I have to say I have never seen more smoke looked like the weed tent at Woodstock, also some neighbors were trying to cook out boy did I feel bad . After 10 minutes I started her up and got out on the lake ASAP so I would not kill these people again with the smoke. The boat ran rough for a bit but then seemed to run very nice much smoother then before, the only problem I had was that **** hesitation again at WOT (read my other posts)and getting chased by the fire tug . I cleaned the plugs and went out again no smoke idle is great very smooth but that WOT hesitation is still there but intermitantly, hope someone has some ideas have a great day....