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    prop questions

    I have a 1990 Johnson 150GT. First, I don't care any thing about top end/high speed performance. Is there a prop that will help with fuel economy? Chuck
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    T n T issue

    We were out yesterday and the T N T quit going up. It would go down and the motor would run when you hit down. It made no sound at all when you hit up. It had been working all day up till the point it quit. The motor was down all the way so we limped back to the launch. I kept hitting the...
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    Motor position censor

    I've got a 1990 150gt and the motor position censor has stopped working. When you turn the key on the needle immediately pegs in the down position. What typically going bad on these? The dash mounted gauge or the actual sensor at the motor? And how can I test for which it is? thanks Chuck
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    150GT 1990 Fast Idle

    I just started my motor for the first time in 5 months. After I got it started it idled very fast. It normally will idle back down once you hit the gas but it wouldn't idle now. What should I check? What exactly makes it idle up at cold start? Chuck
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    24v trolling motor plug

    I just upgraded to a straight 24v trolling motor. I went to a 6 gauge wire as recommended by MK. The only plugs I can find are 12/24 that use a 3 wire setup. Would it hurt to use the 12v plug? Can anyone point me to a 24v 2 wire plug? Chuck
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    Chine Walk

    What is the cause of chine walk? I have a 17' bass boat with a jack plate and a 150 on it. Will a jack plate adjustment help it? Chuck
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    '90 150 GT-something strange today

    I had several threads a while back on this motor. Carbs, water pump, VRO disconnect have all been done. First trip out it ran great, (short trip). I went out today and all was good. I opened it up a couple of times just to test it wide open, the 2nd time I went WOT it went dead after a couple of...
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    Fuel gauge not working

    When I turn the key on the fuel gauge will twitch but the needle does come up. Can someone tell me the test proceedure for the gauge/sending unit? I do have 12v going into the gauge but the wire going back out to the sending unit does not have a full 12v. I also hooked up ohm meter to sending...
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    what's up with this?

    Anyone heard of this? Is this saying the battery will not charge correctly or that the rectifier will be damaged? Chuck
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    Frustrasted with stator

    I did the tests and stator showed bad. My new one delivered today and thought I would check ohms across the two yellow wires to see the difference between a good one and my bad one. It measures the same:mad: What am I doing wrong here???? 1990 Johnson 150 Chuck
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    charging system problem

    1990 John 150 It seems to be one thing after another on this motor. I just built the carbs and it seems to run great. I just happened to look at the volt meter on the dash while I was running it and noticed it only showed 12v. I know before it showed 14 or so. I checked it at the battery with...
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    Float settings

    Do you set your float parallel to the bottom of carb with is upside down? Or as the service manual instructions with the float hanging down? Chuck
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    carb rebuild

    My first carb job. Got the first carb off and apart. Is it necessary to remove the jets? Or just clean and blow them out? I have the service manual for directions but is there anything I should pay extra attention to? Chuck
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    water pump on and now on to the next issue

    Finally got my parts and got the pump on. This was really the first time I had run the motor long enough for it to really warm up. It idles great (although it seems a little fast) but when I start giving it throttle there comes a point when it will no longer go to higher rpm. I can choke it and...
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    water pump housing size

    I put on a new water pump kit today. I fit just fine but the housing itself is thinner than the one that was one it. It also came with shorter bolts to attach it. I was a little concerned it was the wrong pump. Is this normal? 1990 Johnson GT150 Chuck
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    water pump sealer?

    What are the automotive equivalents for the gasket sealer and the M type adhesive? Chuck
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    which manual is best?

    I see a couple of different repair manuals out there. Which do you recommend for the Johnson 150? Chuck
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    Strange warning alarm behavior

    This has happened several times but not everytime. I will turn the key on and the warning alarm comes on and stays on. This happens with the engine cold. When it happens I can turn the switch off and on a couple of times and it will stop. Any pointers on how to trace this down? And how can I...
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    wiring question

    I have seen boats in the past where you have to have the "accessory" switch turned on before running other things controlled from the dash (live well, bilge pump, etc. Is this the standard way they are wired? If so I assume someone has changed the wiring on my boat. Chuck
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    GT150 shift linkage disconnect

    Where do you disconnect the link on this engine to drop the foot? Chuck
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