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    Temperature on 90HP

    1989 90HP. Noticed recently when ran on muffs getting ready for this season the temperature started raising too high. Ordered all new parts; thermostat, gaskets and all the parts associated with the bypass which is under the same cover. Tested on muffs and temp stabilized, I think about 170 or...
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    Run out the fuel?

    Notice when I tilt up the motor for travel some fuel runs out into the rear (the engine well) of the boat. Two questions, is this fairly normal? What about shutting off the fuel and let run until carbs are out of fuel?
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    1989 90 HP missing

    Good compression on all three cylinders, and all within a few lbs of each other. Spark on all three, used timing light on each cylinder one at a time while engine was running. Seems to be missing, so blocked the inlet to each carburetor one at a time. blocked #1 engine bogged down from flooding...
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    1989 90 HP 2 stroke No Spark

    Sorry it this appears twice, fist post said I was not authorized even though I was signed in? Problem: As the subject line states. What has been done: Using a spark gap tester, set to a gap about 1/2 what should be a good gap test. No spark on all three cylinders. Removed the stop wire on...
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    Switch on control box

    On the back side of the the control box is a switch (below the key switch). It seems to be protected by a plastic cover. What is it? what does it do? seems like it is hard to even move it.
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    Water in oil 4 stroke outboard

    What is the most likely reason for water in oil of a 4 stroke outboard. Has great compression and runs fine.
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    Generic compression question on two strokes

    If a two stroke engine runs fine but has compression of 115 115 90, is there reason to be concerned or is the difference within acceptable numbers?
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    1979 80 HP running in gear

    Idles on muffs. Idles in the water fine also. Put in gear and it is like the ignition was turned off Other info. need to put idle lever almost full on to start cold or in water I have tried the opening of carb idle jets wit no change. It did run in gear once this last time I tried, but moments...
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    Merc.1979 80 HP No Spark

    Since last starting, about 2 months ago, engine will not start. After cleaning battery contacts to get a good turnover, would still not start. Removed plugs and put one on wire and pushed against ground. When the engine first starts to crank will get one or two sparks then nothing on cylinder...
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    1979 80 HP Timing Question

    Can I check and set if needed the pick up and max timing without running the engine. I was thinking I could pull the plugs, and connect timing light to #1 then just use the starter motor? Yes I will put on the water muffs. The instructions say must be in water and running.
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    What is this tube out of lower end

    1979 80HP There is a rubber tube about 1/4 inch outer diameter that comes out of the lower end where the linkage for the reverse lock comes out of the lower end. No water comes out when running on muffs. I am guessing it may be for a speedometer, which my boat does not have. Bought motor used so...
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    1979 Mercury 80HP fires but will not run PLEASE

    Posted this without any response in the 17th, so trying again. 1979 80 HP Will not start Bought engine used so I do not know history. Noticed hole in exhaust side plate so replaced it and one of the inner plates which were very pitted and had a hole in it. Had to rebuild starter, it was...
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    1979 80 HP Will not start

    Bought engine used so I do not know history. Noticed hole in exhaust side plate so replaced it and the inner plates which were very pitted. Had to rebuild starter, it was very corroded internally, Removed and rebuilt both carbs. They didn't look too bad though. Replaced the water pump since...
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    Warer pump replace 1979 80 HP

    Ordered kit and dropped lower unit. Removed three nuts and one screw from top of pump. Top cover slid up and off the drive shaft. Slid the impeller up and off the shaft, the pin that keeps it turning with the shaft dropped out. Looks like that will be a pain putting back together. The lower pump...
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    Water pump replacement 1979 80 HP

    Ordered kit and dropped lower unit. Removed three nuts and one screw from top of pump. Top cover slid up and off the drive shaft. Slid the impeller up and off the shaft, the pin that keeps it turning with the shaft dropped out. Looks like that will be a pain putting back together. The lower pump...
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    Cross referencing parts?

    Have a 1979 4cly 80 HP Mercury outboard long shaft with a transom mount swivel that is in bad shape (salt water) Trying to find a used part, since no new ones anymore. There are many on e-bay some that seem close. Is there some way of cross referencing parts from different models? Thanks Everett
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    1967 merury 650 distributor

    Removed cap and proceeded to break rotor, I though it just pulled off like on autos. Most parts are hard to get. I found a complete distributor on ebay which (claimed) came of a working 1966 merc 500. It looks identical to the one I have. I know the part number for mine is 393-2799A7 or A20. How...
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    1967 Mercury 650 Carb linkage

    Have 1967 650 Mercury. Just got running went out to water. Only get about 8 MPH at WOT. Noticed that the linkage needs some adjustment to get the dist. to rotate to WOT stop, BUT notice that the plate that moves the carbs only open them about 1/2 way. There is play before the plate contacts the...
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    1967 65HP Merc pee hole

    I have no history on this eng. got it to start, rebuilt water pump (old one looked good). running on muffs see no water from pee hole BUT I DO NOT KNOW WHERE IT MIGHT BE OR EVEN IF THIS VINTAGE HAS ONE. Comment? pics? Thanks Everett
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    1967 65HP Merc testing for water flow

    Bought boat and motor cheap and no history. Got the engine to start, burnt switch box. I dropped lower unit and installed new water pump parts, the old ones looked ok. When running engine on water muffs I get water flow out the center of prop, and after a few minutes it is slightly warmer than...
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