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    7.4L Running Rough After Overheat

    1997 Big Block 7.4L Carb overheated. Replaced impeller and cured overheat problem. Now boat idles very rough and has a slight miss at higher rpms. Checked plugs and compression and both looked good. Checked for water in fuel and found none. Engine has a engine mounted belt driven sea water pump...
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    1992 Merc 200 XRI

    First off powerhead has been replaced. Rebuilt lift pump and high pressure pump also seized up so it was replaced. Also idle stabalizer has been disconnected. Motor has ran good for almost a year. Now motor will start up and idle fine and sometimes it will come out of the hole and run great...
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    Sierra Engine Oil

    Ive been using sierra stern drive 25W-40 engine oil in my engine. I have a 4 cylinder 3.0L inboard\outboard. Is this a good oil to use or should i be using the 10W-30 oil? Ive heard that because of the load these engines see that it is better to use a heavier weight oil. I live in a relatively...
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    2004 Johnson 90HP Check Engine

    Ive got 2004 johnson 90 hp v-4 that has a check engine light and alarm that comes on almost as soon as you start the engine. Tried disconnecting wires coming from fuel pump sensor to see if that caused it to go off. Alarm still sounded. Will disconnecting that plug make the alarm go of if that...
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    Water in two cylinders

    Working on a late 80's model johnson 60hp 3cyl. It had been overheated badly and before it had been repaired it sat for a little while. Now that the waterpump has been repaired and operating good there is water entering into the bottom two cylinders while running. Already pulled head and checked...
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    Mercruiser 470 Runs With Key in Start Position

    im working on a Mercruiser 470 still with points style ignition. engine will start and run with the key in start position but will not run when key is released to the run postion. Traced out the purple wire and have good voltage to the choke and in the wire coming from it going to the coil. But...
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    Mariner 175 EFI

    Im looking at buying a boat that has a 1997 Mariner 175 Mag EFI. I was wondering if anyone had heard of having any problems out of this motor. Any information would be greatly appreciated!
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    1992 Merc 200HP XRi Blown Up

    Have a 1992 Mercury 200HP XRi motor just blown up. Ordered new power head and getting ready to switch it all over. Although still chasing what caused powerhead failure to start with. Number 4 piston seems to have a hole in the top of it and the connecting rod is pulled out of piston and hanging...
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    Mercruiser 888

    Well here it goes. I have a Mercruiser 888 that got sank a year ago and jus now getting it back going. Starter finally gave it up and had to replace it. But now that ive got it running it will not rev beyond 3,000RPMs and it backfires if you try giving it WOT. Checked timing it was a lil...
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    75HP Mercury will not idle

    Heres a great one. 1999ish (not totally sure on year) model 75HP mercury carbs have been rebuilt fuel pump rebuilt checked reed valves checked idle timing and wot timing all good did sync and link and all that good mess new plugs and checked compression and spark all are good. But engine will...
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    1984 Omc 3.0l

    Im working on a 84 OMC 3.0 I4 its giving me a hard time. Engine runs and starts good but when trying to plane boat out it takes forever to plane and seems like even when you get it on plane it has no power. Carb has been rebuilt and fuel pump too new plugs also. Also anyone know the RPM range...
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    2001 75Hp Merc (Yamaha) 4 Stroke Flooding

    Have a 2001 Mercury Four Stroke that is flooding out of the carbs. Tried running and as soon as you would crank crabs flooded badly and flooded the engine. Pulled of carbs and cleaned didnt replace needle and seat because they didnt look like they were in bad shape. Wondering if i should go...
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    Mercruiser 888 Starting Problem

    Mercruiser 888 (302 Ford) has a starting problem. Engine cranks and seems to fire up and acts like it wants to run but as soon as it starts it shuts off. Havent had alot of time to mess with it but seems like its getting enough fuel and point gap is all good and has a new set of points and a...
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    Yamaha FX 140 4-Stroke High Speed Miss

    Bought 2 2002 yamaha FX 140's 4-Stroke. Lake tested when first got them both ran great. A few days later after a long while of riding one began to have a high speed miss, seemed like it missed whenever you cross another boats wake. If anyone has any advice please assist me with any tips. I am a...
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