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    Corrosion

    Is there any detergent to clean corrosion or I have to scrab it off with a knife, sand it; and anything to prevent it inside the motor and the holes for the bolts of the lower unit, threads are O.K.
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    Motor muffles

    Is it posible to have muffled knocking whe engine works without good timing - throttle to timing plate lever disconnected? It started hard and was a little shaky? I bought it any way. I like mechanical work in winter.
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    1982 Johnson 90 v-4 timing

    I wonder how I adjust the timing plate at idle at what degree and how much does the timing plate move with the throttle lever (degrees), any hint will be appreciated. Thanks
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    lower unit of Johnson 90 V-4 1982

    I opened the lower unit of that motor to replace oil seals because there was plenty of water in the oil when I drained it. I had hard times because it was never done before. The bearings and gears are black instead of light steel grey, just like they come from the store. The color is slightly...
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    Different motors same pitch

    I have experienced something strange: Two different motors with different gear ratio same pitch propeller same max speed that is: a Suzuki DT 65 - 65 hp 1.92 gear ratio 13 pitch propeller 36 NMPH a Johnson 50 hp - gear ratio 2.8 13 pitch propeller 33 NMPH. Both motors at 5200 RPM, on the same...
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    Yamaha 9.9 mid 90's

    I've got a good bargain on an Yamaha 9.9 XL, but want to make it short, do I need a new drive shaft, the shift rod and water pump pipes can be cut, and the rod rethreaded.
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    Rebuild an XL to S

    On the 9.9 hp motors there is an extra section, is it possible to shorten the motor for another purpose by removing the extra section?
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    Johnson v-4 90 hp 1982

    hello to you, I am working on my lower unit and while removing the gear shift lever noticed there was something missing on the carb cover and don'know what it was and if it's important: it should be fastened to the alluminum part on the top, and there are two power packs, a rectifier and one...
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    Johnson v-4 90 hp lower unit

    I can't pull out the bearing casing, could anybody advise me; I removed the four bolts, I have a big washer with two holes opposite the threads on the casing and screwed the bolts in at 30 n/m the casing won't move. I am scared to tighten further not to break the thread in the casing. Is there...
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    Johnson v-4 90 - oil seals

    I want to change the oil seals of the lower unit, but can't pull out the bearing casing. I removed four bolts and try to pull the casing out by fastening bolts in both threads against a washer pushing the outer wall of the lower unit so far without success. I am using a torque wrench and applied...
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    Johnson 90 hp - v-4

    I've recently purchased a V-4 and am preparing it for test run. The lid of the intake air box on the carbs is missing, and I intend to make one myself; so I wonder if I could find out the depth of the lid. I guess it is shaped like a basin. If I find out the depth and the location of the bores...
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    Spare parts

    I've looked over spares catalogs and could not find an upper roller bearing with oil seal for any Johnson V-4 models; for 2 and 3 cyllinder engines from 50 to 70 hp - the bearing is the same with the same part number. Does any one know if it matches with the one of the V-4 as well?
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    1982 90 hp Johnson

    I confused the leads coming out of the power pack to the coils; they are of the same color, but one of them has a stripe alongside, which should be for the upper and which for the lower cyllinder coil. What is the average idle speed of the motor (RPM) on the tach in gear. What is the gear ratio...
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    Motor oil

    Excuse this type of question! In the area where I boat there are many fishermen running on chainsaw oil, saying its higher grade and three times cheaper than the TCW-3, is this bad for the motors? There is a box at the carburetor intake with a lid, Its a silencer I guess, Is it important or I...
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    Tune up of Johnson 90 hp v-4 1982

    What are the max RPM? Can I go at higher RPM for a couple of minutes for propeller selection without trouble? Is it possible to tune up a Johnson 90 hp v-4 to 115 hp. Generally the motors are the same; what is the difference:
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    Transom reinforcement

    I ran my boat with a Suzuki DT 65 and it was OK Now I want to run it with a 90 hp motor which is 55 lb heavier and 25 hp stronger. I have a 15 foot 22 year old boat that is in best condition and wonder if I have to reinforce the transom for the more powerful motor, or I could do without...
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    90 hp Johnson v-4 1982

    I would like to find out the gross weight of the 90 hp Johnson v-4, and if there is any specific trouble with this model?
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    Johnson 90 v-4

    I purchased recently a Johnson 90 hp-v4 motor model j90TLCNB #J5688750 and can not find out the year of manufactureq and can't order spares.
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