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    88 100 hp Merc Kill Switch position

    Can anybody help me with the most basic question of, Is my kill switch supposed to be in the up or down position? I am troubleshooting a no start issue and when its in the up position it sputters but does not start, down position motor just spins like it has no spark. Thanks!!
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    Ouch! need all Merc doctors. Stat!

    Well, had a great day planned today w my 17 Bayliner Capri mated to an 88 100 hp. I went outside and reinstalled my thermostat which I had been running w out for a while. Previously had a telltale problem which a new impeller fixed. Ran it on muffs w no telltale for about 4 mins. Stopped her and...
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    No pee stream from Merc 100 1988. Help!!

    Hi guys, no pee stream from my inline 4 100. Have replaced everything I can think of since acquiring this engine last spring. Water pump, impeller, rebuilt carbs, rebuilt fuel pump, had VRO inspected by best Merc dealer I could find. Oh, compression test and new plugs. Very good, even...
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    Weak Idle on 88 merc 100 4 cylinder

    Hello all, after a long summer of rebuilding my 88 merc 100. Its running great except for the idle. Its stalling at idle, sometimes immediately and sometimes will run for a minute or two. I have rebuilt the carbs, fuel pump, thermostat - poppet valve, and water pump - impeller. Compression all...
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    Proper spark plug for 88 Merc 100 hp?

    Would any one be able to tell me what the proper plug would be for my 4 cylinder 100? Bought the engine from a guy with it on a bass boat and havent acquired a manual yet. Thanks in advance!
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    Low top speed?

    I took out my recently acquired Bayliner Capri 1991 w/ 1988 Mercury 100. Motor tested well with compression, all around 135 lbs. I took the boat out to a nearby river to test. It ran well overall but would only give me 35.5 mph w just me, my 100 lb wife and a well stocked cooler. This is a very...
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    Late 80s Merc 100 alarm when starting

    Hello, Havent determined the exact year of my engine. Ser. #OB301158. Just got it and when we try to start it it gives an alarm. I know this probably the oil sensor but how do I know or repair? Might want to just premix and avoid any problems? Thank you!!
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    Frozen rear engine mounting bolts

    Hello gentlemen, I am attempting my first removal of my 4.3 Mercruiser from my 1987 Wellcraft Elan. Most everything has gone well except for my inability to break free the rear mounting bolts. I have soaked them repeatedly with PB Blaster, tapped lightly(and not so lightly) with a ball peen...
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