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    How do I hook up Tach to 4-cyl 75 hp Mariner/Merc?

    I have just repowered with a 1986ish Mariner 75 4-cyl. Engine runs great, but I'd like to hook up my old tach. The new control box has a round wire plug with 5 pins and a plug-in wire that is brown. The wires to the 5 pins are purple, blue/white, black, black/white and grey. The tach has IGN...
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    1986 Merc 75hp 4 cyl. will not run right

    My 86 75hp 4-cyl. ran great for 7 years. It then began to "run out of fuel" at WOT. If I slowed to idle speed for a few seconds, she'd take off and run wide open - no problem. The problem became more frequent until WOT was only achieved for 10 seconds, then she'd die. Priming the bulb made no...
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    Saltwater Merc vs Freshwater What's the diff?

    I've been wintering in FL, and summers in WI (home state). Lots of "Saltwater Mercs in FL. What's the difference? Just curious.
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    1985 75 hp starves at WOT

    I've been trying to cure this problem for a year. Took engine to reputable, large Mercury dealer, and I stumped them. They called Mercury Marine experts, and they're stumped too. Engine goes to full throttle, then acts like it's running out of gas. Idles and runs at 1/2 throttle all day. Have...
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    86 Merc 75 starves at full throttle

    My 1986 Merc 75 (4 cyl. inline) will take off and run for about 20 seconds at full throttle, then starves out like it's running out of fuel. I have choked it and it gives a burst of speed, but I cannot maintain full throttle. If I back down to about 1/2 throttle, it will run all day - no...
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