1991 Bayliner capri with 3.0 Mercruiser, problem is boat runs great full throttle and when you bring it back down to an idle it drops down to 600 rpm for 2 to3 minutes and then will idle out smooth around 900. Does this every time i run it and some times dies and have to restart.
adjust idle mixture screw. with engine warmed up and running turn the mixture screws [one at a time if you have two vinturie carb] in until the engine runs rough then unscrew until it is smooth again, then 1/4 turn out more. Then do the other screw. If this doesn't work you might have a too high float level in the carb. get the float level setting from a book or supplier and adjust it. or if you are feeling adventurous remove the top of the carb and turn it upside down on a bench. use a ruler and measure from the metal underside of air horn [top of carb] to a place on the float [it can be the bottom or the float or top or a line seam and make note of that measurement. now bend the tang that pushes on the float needle toward the needle to lower the fuel level in the bowl or bend it away from the needle to increse the fuel level. I would lower it by about 1/8 to1/16" at the float where you measured it before. If this doesn't work I would need more info to help more.
the carb. off and took apart only to find a ton of sediment in the
bottom of float bowl. Cleaned carb and installed new carb. kit and a
secondary fuel filter. Runs like a champ now and back to idleing at 650.
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