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Recent content by thomas3120

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    Trying to figure out GPH on my boat & engine

    Hello, I have a 1989 17' Boston Whaler Super Sport Limited which has the same exact hull as the Montauk but instead of the center console it has a "drop-in" gunwale to gunwale console with a large rear hatch. Probably slightly heavier than a Montauk. The engine is a 1989 Johnson GT 100 (max...
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    Way to lower power (system 12V) to power LED?

    Hello, Was wondering what was the best way to lower the power on a 12VDC system to power a LED? Linear/Switching Voltage regulator, other method...? With the new LED plug in lights now on the market for bow/stern conventional bulbs, wondering what the manufacturers use to lower power for the...
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    Need new Torsion Bar axle for my boat trailer

    Hello, I have a Pioneer trailer (model P-1723) that I use for my 17' Whaler. I like the trailer, it's aluminum for the most part and also like the torsion bar suspension. Problem is the torsion bar axle is rusting away fast. A few places I went to say that it's an oddball size and have to...
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    Swapping out Steering Arm Assemblies Johnson 100 to a Evinrude 90. Can it be done?

    Hello, My current Steering Arm (1989 Johnson 100) is rusting badly right above the swivel bracket where there are 2 bolts on either side. Every year I get flakes of rust falling off (for the past several years). Been adding OSPHO to stop the rust and other rust inhibitors...but rust keeps...
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    1989 johnson 100 overheat warning light along with oem alarm horn

    Hello, Seems I recall seeing a post where someone modded an LED or light if engine overheated. Can't seem to find it. I'd like to wire up a warning light (along with my alarm horn which sometimes is hard to hear). Correct me if I'm wrong, when the temp sensors in the cylinders sense an...
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    Hooking up external Tachometer

    I have this older analog Tach that still works great: Was wondering where the best place to connect it to my engine (1989 Johnson 100 J100STLCEM)? And also compare results with my Tach gauge on console. Looks like Grey wire is the Tach signal.. possibly the terminal board? t
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    Ignition Coil Resistance Test results

    Hello, Just doing another check on my 1989 Johnson 100Hp (J100STLCEM). Below, first results are Red lead to Primary terminal and Black lead to ground. Second results are Red lead to Primary terminal and Black lead to High Tension/Secondary terminal. Values in Manual: First test 0.1 (+- 0.05)...
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    1989 Johnson 100 Tune-up questions

    Hello, Haven't had much luck in a few other forums. Thought I try here :) My engine model is J100STLCEM. I guess basically Going in steps but don't quite understand the Cam Follower Pickup adjustment. I'm also getting or appears to be worse gph/ increased fuel consumption. Here's the full...
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