I have a 1985 Yamaha 50hp outboard that will only go 4000 rpm in nuetrial I can tack it out over 6000 rpm. It will run great after I clean the carbs. when I get out on the water after the cleaning it wil run 5200 rpm for about a half hour then cuts back to 4000 rpm. I run seafoam and new gas and still does it. What am I missing here?
Thank You
Thank You
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