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    lugging question

    Are you lugging when you can't reach the max rpms or when you don't run at max rpms? In other words if I can run a V-4 cross flow at 5800 rpms at WOT but choose not to because I don't want to go that fast, am I lugging the motor evn though it is set up to run optimally at WOT?
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    thru hull fitting problem causing wet transom

    I have a 16' tri-hull bass boat that I'm replacing the motor on so after taking the old motor off I was giving the transom a good inspection. All the core wood seems to be in very good shape..solid, yellow, and splintery...I did however find one spot where the inner skin was soft. There is a...
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    trim motor swap

    I am looking at a used mid 80's (not sure on exact year) V4 crossflow...the trim motor is a 2 wire conector and it is bad. I have a working trim motor off of a '79 crossflow that is a 3 wire connector...can a 3-wire trim motor replace the 2-wire motor? I have the box with the solenoid, fuse...
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    warning horn test

    Is there a way to test the warning horn in the control box for a '79 Johnson V-4. The control box is not connected to a motor (or power). I have the wiring diagram for the unit if that helps.
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    stator/tilt and trim relationship question

    I have a '79 100hp Johnson I am replacing because I can't afford or have the skills (not to mention time) to rebuild. I am looking at a used motor that is almost identical but it's a manual tilt model. I plan on using the tilt and trim from my old motor and was noticing that on the BRP parts...
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    late 70's cross flow question...defects?

    I was talking to a guy who runs a local salvage yard/used motor place and was telling him about my 1979 100hp Johnson that recently burned a piston. He told me that he thought he had remembered there being a factory defect in some late 70's cross flows that was directly related to the pistons...
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    water in the gear case

    What are all the ways that water can enter the gear case? Would there be a range from best to worse case scenario? I would guess faulty or no nylon washers on the drain and vent plug would be best case scenario and a cracked gear case would be worst...other ways and thier severity would be...
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    silicone for outboard mounting

    What is the best brand/product of marine sealant to use for making the mouting holes on the motor/transom water tight? any tricks of the trade for doing a good sealing job would be appriciated too! Thanks
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    motor replacement shopping questions

    Well I'm looking into options on replacing my '79 100hp Johnson that has a toasted piston...don't want to sink the money into repair so I'm looking into buying something else used to give me a few years of service until I upgrade boats completeley...I need to get a couple of questions answered...
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    low compression on one cylinder

    Well I've been dealing with this low idle miss for a little while and finally borrowed a compression tester from a friend...did what I should've done in the first place Found that on my '79 Johnson 100 I have 7 psi on my starbioard top cylinder, 95 psi on the bottom and 120 and 125 on the port...
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    timing question

    OK I bought a timing light and made a piston stop out of an old plug and am getting ready to do a link and sync. I am curious though about the idle timing versus the maximum spark advance. Does adjusting the throttle cam during the idle timing adjustment process change the maximum spark advance...
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    throttle cable/idle stop problem

    I bought a 1979 100hp Johnson back in the spring and am still trying to work all the kinks out. When I got the motor it was set to where it would idle around 1500 rpms on the muffs and around 750 rpms in the water. I was going to lower the idle speed to the recomended 650(max) only to find that...
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    compression check

    could some one post a step by step method of doing a compression check on a '79 100hp Johnson. Looks easy enough but I guess there's always a way to "fry" something when you're a "newbie" like me....I'm just good enough with tools to break stuff. :} Thanks!
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    carb assembly replacement compatibility

    I am in the process of rebuilding the carbs in my 1979 Johnson 100hp only to find that the upper carb is in pretty bad shape...lots of scratches and nicks in the coreplug casting, lowspeed orifice, stripped screws etc. I'm affraid this is why I'm having problems at low rpms. If I have to replace...
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    animal droppings in bilge

    Went to do a little maintenance in my bilge and found animal droppings...not sure what animal but they are about the size and shape of a tic-tac (don't smell like tic-tacs for sure). I put a rat trap down in there if by chance it's a rodent....my biggest concern is if it's a snake....don't want...
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    Carb core plug adhesive

    I'm needing to know what other adhesives will work with sealing the core plug in a '79 Johnson 100hp carb considering that the OMC adhesive M is no longer availible in it's "original form". I have read here that the OMC adhesive M is similar if not identical to (replaced by) 3M 847, Marprox...
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    trim cylinder o ring and seal replacement '79 100hp Johnson

    I need to replace the seals and o rings on one of my trim cylinders (seeping fluid). I know I'll need the "special tool" for the removal of the cap but can I disasemble the trim cylinder without removing the TnT system from the motor....I don't have the means to remove the outboard from the boat...
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    correct fuel hose

    I found a crack/leak in the section of fuel hose that runs from the fuel pump (T) to the top carb. I'm going to go ahead and replace all the fuel hoses from the fuel fittng to the filter/pump and to both carbs but I want to make sure I get the right hoses. My OEM manual does not say anything...
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    re-building carbs without an aircompressor

    I am gearing up to do my first carb re-build and have read everywhere that blowing compressed air through all passages and drying with compressed air are essential steps in the process. I don't own an air compressor so I was wondering if there was an alternative. Would that aerosol air can they...
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    wrong coil causing engine to miss?

    I have been trying to diagnose an engine misfire (at low RPM's/idle) on my '79 100hp and was inspecting the coils and noticed that the top coil on the right side was actually a coil that is used on "'85-thru" models. Obviouslly my 1979 motor does not fall under the category or '85-thru. Could...
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