Hello Folks, I am new to the forum, but not to boating. I have a 1977 mercury 1500 inline 6 cylinder that I am having trouble with at the lake. When the muffs are on the boat sitting in the yard it starts good and runs good, when I get it to the lake and under a load it will not go, it boggs down and sometimes goes dead. I have rebuilt and cleaned the carbs and changed the spark plugs. I was at the lake the other day and it came up and ran pretty good, run out around 42 mph normally tops around 50 mph, when I went back to the lake a couple of days later it would not hardly run I managed to get it on palne one time and it ran o.k. but no speed then I set it back down to idle and it would not come back up. It started bogging down again, loaded it up brought it home and here I am any help would be greatly appreciated.
thanks ghigh1617
thanks ghigh1617