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    QD-15 10hp Johnson lower unit issue

    Hello I have a QD-15 10hp Johnson with a lower unit issue. The pins that hold the gears in place are broke. Someone tried to correct this problem by drilling another hole and put a pin in that but that one broke. I want to replace that housing and found one from a QD-14 10hp. Would that work in...
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    Changing 4 stroke motor oil

    Hello all I hope I’m in the right forum for this. I want to change the oil in my Yamaha 9.9hp outboard motor. I was told to use marine 10w30 oil. What is the difference between that oil and regular 10w30 motor oil? Thanks, Gary
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    1939 Evinrude fuel question

    Hello all I have a 1939 1.8hp Johnson that has a a knob on top of the fuel cap. Do I need to have that open when I start the motor? If so do I need to close it after the motor starts? I’ve seen that style of gas cap on several type of older motors. Would it be the same on any motor that has...
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    1962 5hp sea king water pump

    Hello Hopefully I’m in the right place for this. I have a 1962 5hp Sea King that needs a water pump replaced. Do I need to remove the power head to drop the lower unit to get to the water pump? I saw a video where the lower unit was dropped a few inches and then had bolts removed from the shift...
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    1954 10 hp johnson carb issue

    I'm working on a 1954 10hp Johnson. It use to run really well but it has sat for some time now. It was hard to start and I cleaned the carb and replaced the points and it now starts more easily but it runs rough. When it stops smoke comes out the carb. I don't remember seeing that before. What...
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    1958 7.5hp Johnson oil leak

    I'm working on this 1958 7.5hp Johnson. It starts up OK but after about 30-60 seconds it starts to run rough at any speed and if I leave the throttle alone, the speed will increase and then decrease and back and forth like that then will eventually stall out and the throttle does not move where...
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    1967 9.8hp mercury flywheel

    Hello all I’m working on a 1967 9.8hp mercury and I took the flywheel off and lost the nut. No idea where it went. Can anyone tell me what the thread size is so I can go to hardware store to get another one? Thanks Gary
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    1954 10HP Johnson crank question

    I'm working on this 1954 QD-15 10hp Johnson and wondered about an O ring on the crankshaft. If you look at the attached diagram, the O ring is part number 7. Is that supposed to go around the bearing or between the bearing and the seal? I ask because it was around the bearing when I took it...
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    1954 10 johnson rebuild

    I have a 1954 10 hp johnson that I'm deciding whether to put new rings in it. It has become hard to start and the compression is about 60psi in each cylinder. I have cleaned the carb and changed out the points but doesn't run like it used to. It was a good running motor and I wonder if it would...
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    Sea King Spark plugs

    I'm working on a 1962 5hp Sea King and found it has a bad spark plug. The plug is J4C and the local auto stores don't carry that. I replaced both plugs with J6C. It starts and runs much better but I wonder if that is a correct plug to use. What plug is a suitable replacement? Thanks, Gary
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    Fuel line size

    I work on Johnson motors from the 60's-70's. What is the proper ID for a fuel line? Is there a difference in ID size between a 10hp and 25hp? Thanks, Gary
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    1976 25hp Johnson ignition question

    Hello all I normally work on the smaller hp motors but I was asked to work on a 1976 25hp Johnson that has sat for many years and won't start. Needless to say the ignition is a little different then a smaller hp motor. There are two blue coils on the side of the motor that go to the plugs and...
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    Carb issue with 1969 6hp Johnson

    Hello all I want to take the carb off my 1969 6hp Johnson and clean it. Do I have to remove that recoil starter to do it? I do not have much access to the right nut on the carb. If I do need to remove it, is there a easy way to do it without uncoiling that spring inside the recoil? I've had to...
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    1958 7.5HP Johnson prop

    Is the prop from a 1958 7.5hp Johnson the same as a prop from a 1958 5hp Evinrude? I'm working on a 7.5hp Johnson and it starts up and runs well in neutral and the motor revs up good when I increase the throttle but when I put it in gear, it doesn't run right. The best way to describe it is the...
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    1956 15hp Johnson electric start question

    Hello all I'm working on a 1956 15hp Johnson and I was wondering how difficult it would be to convert it to electric start and are the parts still available to do it. I have to really yank to get it start it. Thanks, Gary
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    1958 Johnson prop question

    Another question on my 1958 7.5hp Johnson. I need to replace the prop and it has a rubber cap on the end. I tried to turn it off but it didn't come off and I tried to pry it but it started to crack. How do I get that rubber cap off with out damaging it Gary
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    1958 Johnson 7.5hp water pump issue

    I replaced the water pump in my 1958 7.5hp Johnson. After I started it up, I noticed water coming out at the bottom of head on the back left at the base and also noticed no water coming out where it should. I plug that hole with my finger and water came out where it should. I haven't seen this...
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    1958 7.5hp Johnson water pump replacement

    I need to replace the water pump in a 1958 7.5 Johnson. Doesn't that lower just drop off when you take those 4 bolts off? This one comes down about an inch and stops and seems hung up on something and I do not want to force it off. Do I need to take the power head off to replace this pump...
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    1969 6hp Johnson stalling

    Hello All I have a 1969 6hp Johnson that hadn't run in a couple of years. Last week I put it in a barrel and after a few pulls it started up and ran well in neutral and in gear and the water pump was working. I let it run in gear for 15 minutes with no issues. I did have the cover off the...
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    1958 7.5hp Johnson Carburetor swap

    I picked up a 1958 7.5hp Johnson that did not have a carburetor. I have a carburetor from a 1958 5.5hp Johnson. Can I put that one on the 7.5hp Johnson? Thanks, Gary
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