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  1. R

    Assembly question

    I’m attempting to reassembly a 1982 25 HP Mercury. Question: Should I assemble pistons on crankshaft first or assemble the pistons in first then assemble crankshaft . I have a manual buts it’s not helping much. Thanks
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    Mercury 25hp (5842749 serial #) Locked up.

    Just got this motor running , 120 psi compression both cylinders, plenty of oil mixed with gasoline, ran it several times in a barrel , shifted fwd and rev , then tried starting ,motor was locked , wouldn’t budge. Does have electric start , took off pull rope starter and tried turning with both...
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    Froze up 25 hp 5842749 serial no.

    Got this running. Ran it several times in a barrel. 120 psi compression both cylinders. Plenty of oil mixed in with the gas . Tried starting(has electric start) , motor is froze , grabbed flywheel with both hands , won’t budge. Don’t have a clue what happened. Any suggestions? All help appreciated.
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    25 hp Mercury serial #5842749 1981 , no spark.

    Replaced stator, trigger assembly , switch box and coils still no spark . Then got a manual ,checked Stator (good) , trigger assembly (good) , coils(good) but don’t know if switch box can be checked doesn’t show in book , old one looked really bad all that tar looking stuff was oily and mostly...
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    Year made ?

    Mercury 25 hp serial number 5842749 . Can someone give me the year this was made ? Thanks
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    Kill switch wires

    1981 25hp Mercury. where does the two kill switch wires go on the switch box . One wire black , one wire yellow/black. Thanks
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    Wire location ?

    1980 25hp Mercury 5842749 Replaced switch box ,new box has a wire approximately 6” long coming out from it , my question is where does it go, old box did not have one but it was in bad shape so originally it might of had one ?
  8. R

    Broken magnets

    1976 25hp Mercury serial #5842749 Outer magnets busted in flywheel,question can these be replaced ,if so where can they be purchased at? Or should I look for a used flywheel?
  9. R

    Water pump replacement 69 9.5HP

    Need to change water pump , don’t have a manual, I know to take the 4 bolts out but what about linkage to change gears. Not my motor trying to help someone out. I do have a 57 35HP that I upkeep . Can someone help ? Thanks Motor is a 1969 9.5 Johnson (that is a well neglected motor) ? Got it...
  10. R

    What year?

    Model 9R-69S Serial no. J3092930 9 1/2 hp Johnson , can someone tell me what year this is ? T H A N K S .
  11. R

    Oil/fuel Question

    1957 Johnson 35 hp , what oil to gas ratio ? What grade of gas?(regular mid or high?)
  12. R

    1957 35 Johnson (carb adjustment)

    Adjusted carb to run wide open but when it's on slow running have to adjust high and low jets about half a turn richer and when running slow have to adjust jets half a turn leaner . Can someone please point me into what to check for this?
  13. R

    Replacing head gasket 1957 35hp Johnson

    Head gasket that I just bought is bowed out from metal rings . Question should I soak it in something, it's really stiff . Thanks for your consideration.
  14. R

    1957 35hp Johnson , Quits running.

    Motor quits running . ( Has fuel pump) Fuel line bulb is collapsed , disconnect from fuel tank ,pump bulb up and it will run some then quit again (tank is vented) . Noticed water leaking down from power head , made it back to boat ramp , at home put motor in barrel and after running a while it...
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    Float problem

    Took off from launching , about a mile later motor quit . Started checking , had good fire both plugs , but gas leaking from carburetor . Had trolling motor and 2 strong batteries made it back to boat launch . Took carburetor off as float was stuck , cork float appeared to be swollen . Replaced...
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    Fuel bulb collapse's

    2000 90 Johnson . Runs a few minutes and quits. Tank is vented . Fuel bulb is collapsed , wait a while after disconnection hose on bulb ,pump backup , runs a few minutes , quits again . I think tank has trash in it . What do you think? Also put on a new bulb, no change.
  17. R

    Coating aluminum boat

    Riveted aluminum boat has slight leak , what is a good coating? I've asked this before and used what was suggested but this is another boat and I can't remember what I used but whatever it was it worked great . Thanks for your consideration.
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    Ignition switch

    Ignition switch broke , what is the part number ? 2000 90hp Johnson 90VLSSE This is confusing to me because it lists three switches. Thanks for your help.
  19. R

    Leaking alum. Boat

    Got a 49 year old 18 foot riveted aluminum boat that "leaks" . Does anyone have any suggestions what to coat with . Flex seal is out . PS: salt water use.
  20. R

    2000 90hp Johnson Hard to start.

    Primer clicks when key is pushed in but won't start until red primer indicator is turned up . What should I do to fix this??
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