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    Need to reduce ventilation

    I have another boat with a 15 pitch solas amita (johnson, so different splines) and it has considerable cup on the trailing edge I can feel, so that's what I was going by; I may be wrong about no cup. With my current engine height the a/v plate just skims the surface of the water; there is a...
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    Need to reduce ventilation

    I have a 14ft side console Lund with a 40hp mariner/merc with electric trim and have ventilation issues. I have copied the questions from the sticky but the one thing not mentioned here is a/v height above the bottom of the boat. I currently have the engine on its middle mounting hole putting...
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    Mercury classic 50 HP - part 2

    Such a step-by-step guide exists; you need to buy a factory service manual and it'll walk you through the process.
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    Identification help

    The needle and seat being stuck isn't really a concern, just replace them. As for the fuel inlet being broken off you may be able to fix it, or have a machine shop fix it. In the past I've been able to drill them out and glue new ones in with an MEK-based contact cement called seal-all. I used...
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    Power trim Wire, 2 or 3?

    Is your third wire going from one of the motor mounting bolts to the clamp bracket of the engine? This is a ground wire to keep the PTT assembly at the same voltage potential as the engine/hull to prevent galvanic corrosion. This has nothing to do with the operation of the unit and it'll work...
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    Merc 40 hp tracker dies after running full throttle

    Is this the same as the mid-90's through early 2000's mariner/merc? If so those don't have headgaskets (at least the 2 cyl version doesn't), they're really simple engines. Do you have grey fuel hose with the inner plastic liner? The liner comes loose and randomly stops the flow of fuel killing...
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    Johnson 1997 8hp reed swap

    CCMS might have reeds for it, way cheaper than OEM, too. They were 1/4 the price for my Mercury.
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    1998 15HP 4-Stroke Water in engine oil after impellor change?

    The spring in the oil seal should be facing toward the engine, not away; maybe that engine has two seals back-to-back? Maybe someone has been in there and installed it backwards? (yes, i've seen this). Either way, you have a known problem, fix this problem! You don't want the seal to blow out...
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    Johnson 35 with intermittent stream before thermostat opens

    Yea, that's exactly how the service manual describes how to do it, I've done this process countless times on vehicle heads and other small engines. One of the bottom head bolts snapped off, one in the middle snapped off, and the one on the stbd side that has the back sides of the threads...
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    Johnson 35 with intermittent stream before thermostat opens

    well so... I can't leave things well enough alone, if it isn't perfect i'm not done. Pulled the cylinder head off (only two bolts on this stupid turd broke, and one bolt hole stripped out...), i think it's a blown headgasket. The gasket looks suspect, it's a bit burned, the lower portion of the...
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    Johnson 35 with intermittent stream before thermostat opens

    I pulled the exhaust cover off and miraculously 6 of the bolts didn't break off! The pistons and cylinder walls and piston skirts/rings look amazing. Sadly there's no "smoking gun," except for one bolt that was blackened with exhaust, it doesn't seem to have any blown gaskets or holes in the...
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    Military Outboard OMC 35hp

    My 35 runs beautifully except after i shut it off for 10-15 minutes. It takes several pulls to start with the throttle as far open as allowed in neutral, it stumbles, misses, farts, then after 10 seconds snaps out of it and runs perfectly. Sounds like the same thing and I have no idea what...
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    Show Your Lund!!!!!!!!!!!!!

    I bought this lund with an ugly paintjob really cheap. Has a 30hp mariner that didn't run properly, so I solved that and uprated it to 40hp while I was in there. It has hundreds of pounds of waterlogged, rotten foam under the rear seats and a rotten transom. Working on fixing those now, by the...
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    Johnson 35 with intermittent stream before thermostat opens

    This thing runs like a bat out of hell, pushes my 14ft starcraft to 30kts, so I don't think it's blown up. But I don't want it to
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    Johnson 35 with intermittent stream before thermostat opens

    I have and those work in some cases. If you're working on aluminum and can get the heater coil around the boss where the threads are you can often free it up, but just heating the bolt head usually doesn't do anything (besides round the head off because you got it too hot...). The reason you...
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    Johnson 35 with intermittent stream before thermostat opens

    Crank the mig welder up hot enough to melt the bolt off flush with the surface. Turn the welder down a bit and weld blobs onto the stump. Immediately hit it with wd40 (or whatever) and twist it out with vise grips. Works almost every time without damaging the threads. Pro tip if you have a...
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    Johnson 35 with intermittent stream before thermostat opens

    I use it mostly in fresh water, but i have no idea how it was used for the last 40 years of its life.
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    Johnson 35 with intermittent stream before thermostat opens

    heh yea... that's kinda how I feel about it. Doesn't overheat and works fine once the thermostat is open, there isn't much season left so maybe i'll take it apart this winter. I only spent about 5 minutes on each broken bolt doing the the thermostat, so hopefully it isn't worse than that one...
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    Mariner 40 hp.

    I have the same engine on a 14ft lund with a 15 pitch Michigan wheel and hit somewhere in the mid to high 5000's depending on load. The engine has a progressive redline where it starts to retard ignition timing around 6000 and goes to complete spark cut after that, so while it's not amazing to...
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    Johnson 35 with intermittent stream before thermostat opens

    This bottom bolt here (which looks like so much fun to deal with) has snapped itself off, which is why i wonder if there's somehow exhaust sneaking into the cooling water, then since there's more flow out the top of the head once the thermostat opens (or the poppet allows it to open), it...
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