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    Prestolite starter assembly

    I opened up and cleaned out this Prestolite MKW4001 starter off my 1973 115hp Johnson when I first got it. It was a mess inside and did seem to spin the motor a bit faster after a clean out. I was troubleshooting the motor a bit at the time. Since then I noticed that when the motor has been hard...
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    Confused about tank fuel fitting diameter

    I have a 115hp OMC crossflow from the 70s. People say that you should use 5/16" fuel hose or even 3/8" but the brass OMC tank fittings only come with one size bayonet which is 1/4" diameter with 4 little holes in the end where the fuel comes out. The female connector comes in 5/16" or 3/8" tail...
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    1983 Johnson 90hp - what happened to this cylinder?

    I bought this motor as a parts motor for literally next to nothing. In the interest of learning I checked the plugs. One looked like this. It is from cylinder 1. I then put an endoscope in and removed that bypass cover. The top of the piston was clean comapred to the other 3 (metallic grey as...
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    DVA adapter vs DVA analog meter for sensor and coil wire testing

    Hi, I have a few 1970's V4 crossflows. Part of the ignition troubleshooting is to measure the output from sensor wires to gnd and orange coil wires to gnd. These are supposed to be 150V. I have never got this to work using my homemade DVA adapter. It seems to work fine for stator measurement and...
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    Looking for a Tohatsu M5A service manual ?

    Yesterday I got given this little air-cooled piece of history. Doesn't have a manufacturers plate but looks same as the pic below (not mine). Only thing that is missing is the recoil starter. Very simple and well made it seems. Loud and smoky no doubt! Thinking about putting it on my Cobra Fish...
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    Stuffers on crossflow

    Hi everyone. I had a set of stuffers from a wrecked motor I bought ages ago. I finally got a replacement intake manifold gasket in the mail and decided it was time to put them in. The stuffers sit proud of the manifold when in position and when I try to tighten up the bolts to compress them down...
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    Chrysler 115 outboard

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    Spark plug wire for 1975 Johnson 115

    I have a cracked spark plug wire on the above motor. I discovered it via a nice shock. I have some kits with wire and crimp connectors for a Mercruiser V8 which I can use to make a new lead. The wire is labelled Mercruiser 2208 suppression which indicates some kind of EMI shielding. It is also...
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    Identifying old SS OMC prop size

    I have 4 SS props that came with various parts engines I have bought. They are 13 spline for mid 70's V4 OMC motors - all were between 73-77 models 85hp or 115hp. I cannot see any markings anywhere on these and cannot find much on the internet about the options that were available for pitch at...
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    1975 Johnson 115 air box cover required?

    My motor didn't come with an airbox cover on it when I bought it. They are available on ebay in the states but not locally here in Australia currently. May find one at a wreckers if I'm lucky for $100 or so. Gasket is $27 from Crowley. Is it necessary to have this on or is it something that...
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    1975 Johnson 115 water tube repair

    Ok. Im not having loads of luck with this engine right now. Previous owner had tried to use pieces of irrigation tube as guide tubes. They had crushed into the housing causing the tubes to bend out of shape. I am wondering about the best way to repair these. I think they are beyong bending...
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    Help with troubleshooting electrics on 1975 Johnson 115

    Ok. So i have this engine with very weak spark. The spark is thin and yellow and can only jump a small gap on the spark tester. Here's what I have done so far. Checked compression. About 115 across all 4 cylinders. Engine is spinning fast on starter. New battery. Ground connections all...
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    This coming out of 1975 Johnson 115 lower unit.

    I decided I'd get prepared and change the fluid in the lower unit of my motor while I work on troubleshooting the electrics. I have only owned the motor for about 1 month and not had it running yet but overall it is in good condition. When I undid the plug this is what came out. It was thick and...
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    1975 Johnson 115 starter motor

    I just bought the above engine. The previous owner said it had no spark. I hooked it up to a battery and found the starter would barely turn the motor over. I isolated the cause to the starter motor and pulled the starter apart. One of the magnets was broken. These starters seem to be very...
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