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    1986 Mercury 90 hp 6 cylinder only running on #2, 4 and 6 cylinders

    The CDI electronics web site should have a troubleshooting guide for the ign system. Your motor will have twin switchboxes. Trace wires from under the flywheel to the switchboxes. They may be stacked. There is usually an ohm test for the stator windings.
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    how to remove water pump base 1978 1400 EZ Shift?

    The waterpump base is held in place by the oring and the friction of the studs.
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    how to remove water pump base 1978 1400 EZ Shift?

    You might give the gearcase a couple of PSI pressure to check for where it leaks. The driveshaft seal is an obvious candidate for leaking. The shift seal can also leak, as well as the propshaft seals, although the driveshaft leaked more often than the others on my IL6. Use two pry bars on the...
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    Stringer height

    You might repost in the engine section for your motor. Those guys are experts.
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    Cheap floor and foam replacement for weekend.

    Gee, I gave you some formulas to determine an estimate. I think those others quoted are too high, however, nothing beats your estimate.
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    1994 Johnson 150 HP

    The dry chemical in a fire extinguisher is real caustic. It corrodes everything it touches. Make sure you wash it off of everything. Maybe it fogged the optical sensor?
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    Bilge Pumps Not Working

    You bought a 35 year old boat. You will be replacing much more stuff that that. The only issue with repair of the bilge pumps is usually getting to them. Use some clip leads to provide battery power directly to them and see if they work. If not pull them out and get new ones. If they work...
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    looking for a place to install pole holders on my bow runner.

    You can install them on any railings you have. I screwed 10 pieces of PVC pipe on a piece of 5/4 and used copper pipe straps and wood screws to attach to the railing of my friends 30 foot cruiser. We removed them when not fishing. You can install them on the transom inside the boat or more...
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    Does Tohatsu make motors for Mercury or vice versa?

    A few years ago my neighbor replaced his twin 225HP Merc outboards with Tohatsu 225s. He indicated that he could not get new Mercs due to supply chain issues, but the Tohatsu's were the same as Mercury. true or not?
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    Water pump issues

    When you rebuild waterpump you need to replace impeller, wearplate and two gaskets, 1 on each side of wearplate, at a minimum. Make sure these gaskets match wearplate and waterpump base cutouts. If the pump cover stainless steel cup is scratched, replace that also. If the pump base is melted...
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    1998 Johnson 115ELECM vapor pump

    Gee, it looks like crowleymarine sells them. No?
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    Rod bearing needles

    Not sure they come separately, as they look to be caged.. Here is set for rods and mains https://www.crowleymarine.com/evinrude/products/0387787-connecting-rod-bearing-assembly https://www.crowleymarine.com/evinrude/products/5007190-center-main-needle-retainer-assembly
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    Float setting on 1998 Johnson J115ELECM

    I would recommend you doublecheck the part numbers for the carb kits, across a couple of sources. When I ordered carb kits for my '98 Johnny J150EXECD, I was sent the wrong ones. They were real close, as in most of the gaskets fit, but the carb base spaghetti seals were wrong.
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    Gas and vent connection

    Boats usually have either a separate vent and fill or a combo one. I am not sure what kind you have, but try the marine stores like Overtons, West Marine, heck maybe even iBoats.
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    Fuel filler hose

    Fuel fillers are normally on the outside of the boat, so fuel doesn't spill inside the hull. I am not sure why you would want two fill fittings for one tank. However, a brass Y in 1-1/2" size should work, I would think.
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    Top speed

    OK, so what was the HP difference between the '05 Merc EFI and the newer engine in HP?
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    1985 Black Max 150 Hp Leaks oil out of reservoir cap. I replaced the cap and still leaking.

    Gee, I always carry a gallon of 2 cycle oil with me. If the oil injection fails, I dump the oil into the fuel tank and rock the boat a bit to mix it.
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    Top speed

    Do what you can to optimize, as was suggested. Pontoon boats are displacement hulls, for the most part. as such, 20MPH is not the best they can do, but is close. My neighbor has a 24' pontoon with a 150HP Yammie. He gets 22mph.
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    1979 115 ADI no spark, everything is new.

    When the orange wires ground they tell the switchboxes to stop making spark. Disconnect them from the switchboxes and test for spark. If spark returns, check the wiring from switchboxes to ign key for continuity. They should not have any voltage on them and must connect to one of the "M"...
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    Cheap floor and foam replacement for weekend.

    It is probably better if you do not rip the boat apart and patch it for the season. If you rip out the foam and rotten wood, and do not replace it with new foam and properly attached wood, the boat could be weaker than it is now. Alternatively, you could screw down some new plywood decking...
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