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    1990 Mercury 100 hp Cough Sputter Backfire

    I have a 1990 Mercury 100hp 2+2 outboard that I have got to idle and purr like a kitten but as when I jump to say to 1500 to 2000 rpms it run fine for about a minute then it backfires through the exhaust about every 15 seconds or so. I have gone through the service manual. TDC line up exactly on...
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    Mercury 100hp - rough idle and acceleration - Video posted

    I have been struggling with this motor to get it running smoothly. I have replaced plugs and wires. I also drained the fuel tank, replaced the fuel filter and water/fuel separator. Also have rebuilt the top two carbs. I have also gone through the link and sync per the service manual. After all...
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    1990 Mercury 100hp 2+2 - Idle needle question

    I am rebuilding the carbs which are 3301-9532's. The question I have the rebuild kits have different needles then what is in the carbs. Even one kit has a different needle then the other. The needles in the carb have a long taper that comes to a point. The new needle have notches then a small...
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    1990 100hp 2+2 Link and Sync questions

    I am new this motor and still trying to dial it in. One issue was fuel and will need to drain the tank. Anyways the questions I have while doing a link and sync are: 1. What is the best way to ground the plug wires? Anyone have any good diagrams or photos? A really good description will also...
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    Mercury 100 2+2 Fuel issue?

    I have a 1990 100hp 2+2. First of all I am new to this large of outboards. I was having an problem with it at low idle. Anyways I went through the service book and did the link and sync. While still having problems I reached down and grabbed the fuel bulb and starting pumping and there was no...
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    1989 9.9hp or 15hp 2-stroke drive shaft

    I am looking for a drive shaft for a 1989 9.9hp or 15hp 2-stroke. The part number is 6E7-45501-01-00. The question I have does anyone know if this part is interchangeable with another motor? I know the later Yamaha 4-stroke shafts look very similar in the diagrams and also the earlier Mariners...
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    2003 DF 9.9 Lower unit

    I am looking at buying a 2003 DF9.9 that needs a lower unit. Well atleast it will need a new housing because it is broken due to corrosion. Well that is the story the seller is telling me. Anyways I was wonder if anyone knows what years and models are inter changeable with this motor. I am...
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    18 HP Mercury Outboard? Need help with ID

    I just bought a little boat with an 18hp Mercury electric start long shaft outboard. Atleast the cowling has 18hp on it. But when I go look at a diagrams there is a different carburetor shown. Here is the numbers I have. For the motor the only ID plate I can find has a serial number of 5861174...
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    Raw water circulation question/help....

    I have a 1989 Mercruiser 470, 165, 3.7L. I have an issue somewhere in my raw water cooling. Right now I have water leaking or should say being forced out the back gasket of the heat exchanger. I pulled the front inlet and there is lots of water going in. I pulled the hose from the power steering...
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    Need Help! - Water pump / impeller housing ID

    I went to replace my entire water pump housing and I come to find out my lower unit might have been replace by the previous owner. I took the numbers off of the housing (0C508233) and gave them to the marine shop and they gave me the kit which the white base in the photos came in. As you can see...
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    470 Altenator Conversion Kit wiring - help

    1989 19.5 foot Bluewater, 470, 3.7L, 165hp Because I am a cheap bastard and love the challenge to create, I built my own alternator conversion kit for my 470. It actually looks pretty good (not to ghetto like others DIY I have seen). I based it off of an ?Ebay? kit and when all said and done...
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    470 - backfire, cough and sputtering upon shut down

    From fixing one problem to the start of a new problem. I just got done replacing the exhaust shutters on a motor that probably hasn’t had them in years (see previous post). Anyways I have a 1989 470, 3.7L, 165hp motor that has decided now to backfire, cough and sputter upon shut down. I runs and...
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    470 3.7L Exhaust flapper question - Engine performance

    I am curious to know that he effects the exhaust flapper has on the engine timing and performance. My situation is that I have a 1989 470, 3.7L, 165hp. I purchased the boat about 2 years ago and have been fixing/updating the boat and motor since. I believe the previous owner(s) did not know...
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    Excessive exhaust steam?

    I have an 1989 Mercruiser 470, 224, 3.7L. I have been doing a lot of work on this engine over the last year. It seems lately that there is more steam coming out of the exhaust then usually. This is on muffs in my driveway. I have added a video on Youtube. Does this look normal for this motor...
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    J1171 Trim Motor Troubleshooting

    I am trying to trouble shoot my Trim Motor. Last year it started to only click when I pressed up or down and then after a couple of tries the drive would engage and go up and down. Now this year it just stopped working all together. No clicks no nothing when I hit the switch. So I downloaded the...
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    Water Temp Switch

    I have 1989 Mercruiser 470 3.7L 165HP. OK we have all done it and I did it again. I bought the wrong part. I was looking to buy the water temp sending unit but I bought the switch instead. Well anyways I have sense bought a sending unit but thought I would install a the new switch because it is...
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    Rebuild Head - 470 3.7L

    I have a 1989 Mercruiser 470 3.7l 165hp motor and I am going to have the head rebuilt. Main reason is it smokes bad on initial start up so I figure the seals must be going out. Plus I wanted to replace the head gasket anyways. Does anyone live in the Seattle / Everett area that can recommend a...
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    1989 470, 3.7L - dual battery install - confirm

    I have a 1989 MCM 470, 3.7L that I just installed dual batteries on with a Perko switch. The switch selection is 1, 2, All. The reason I am not posting in the electrical forum is that I want to confirm the charging system in my boat. I also still have the stator and not an alt. So according to...
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    470, 3.7L -Interrupt switch wiring - Old vs New

    I have an 1989 470, 3.7L, 165 HP Mercruiser. To make a long story short (I have posted the other part of the story earlier) I need help with the interrupt switch wiring. I believe I have a bad connection in the switch which keeps cutting out the engine when shifting. I have attached the new...
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    470, 3.7L - Cut out switch issue? No spark to coil.

    I have a 1989 Bluewater with a 470, 3.7L, 165hp MerCruiser. I had finally got the boat to were I thought it would safe and perform on the water. So last Saturday I put it in the water for the first time since I have owned it. Turned it over and fired right up. Warmed up the motor for about 15...
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