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  1. JJB

    1996 Johnson 25 Hp overheated

    I wanted to get some feedback on a1996 25 Hp I can pick up cheap. the person said he had a water pump go bad and it overheated. He said he shut it off then got it home. He started it one time shut it off before it overheated again but now it won't start. He said it turns free and thinks it...
  2. JJB

    Johnson 25 HP powerheads swap

    I know that Johnson 25 hp powerheads can be swap across quite a few years 1990-2000. Does anyone know if they also fit years1989 and below 25 hp models? thanks for the input JJB
  3. JJB

    mercury 7.5 , 7391A3 / 7391T3 pistons

    I have a 1979 7.5 mercury OB . the pistons in the motor have 2 rings on them. I notice the mercury replaced them with a 3 ring piston type. There are still some old stock 2 ring pistons around or should I replace them with 3 ring type. 7391A3 vrs 7391T3 pistons . thanks for the input Jb
  4. JJB

    Mercury 7.5 HP Carb

    I have a mercury1979 7.5 HP serial#5440232. I have two carbs for it a 7.5 that came with the motor and a 9.8 carb I acquired. they both fit and the motor starts with both. The one 9.8 carb does not have the bleed drain tube connection on it as the 7.5 does. can I plug the drain tube line on the...
  5. JJB

    1979 mercury 7.5 Hp Lower unit exchange

    I have a 1979 merc 7.5 long shaft. the lower unit is bad and I wanted to know if anyone knows if I can use other years 7.5 lower units and just change out the shift shaft and drive shafts and it will work with 1997 7.5. Thanks for the input.JJB
  6. JJB

    1979 mercury 7.5 HP stator voltage

    I have a 1979 Mercury 7.5 HP and wanted to know if it's possible to check the voltage of the stator output at the rectifier. what should the voltage be? all the reference in the manual just gives you oms readings of it. I also wanted to know if you can check the switch box voltage output to the...
  7. JJB

    average Longevity

    I wanted to get some advice. I have a 2000 Johnson brought it used and have put about 700 hrs of offshore run / trolling over 10 yrs. I have 100 psi across all cyl. she starts right up runs good but smokes like a fish smoker lately. I do hear a slight knock off and on in the lower end of one...
  8. JJB

    2000 175 Johnson Pistons

    I wanted to get some advice on Pistons for a 2000 Johnson 175 hp model # J175vxsss carb type motor . I am going rebuild and will be replacing them with .20 over . are aftermarket as good as Johnson oem pistons ? what pistons kits would be be best to use if Johnson .20 over are not in stock ...
  9. JJB

    Johnson 2000 175 lower unit upper bearing

    I wanted to know if I replace the upper drive shaft bearing and seals as p/n 0439476 - Drive Shaft Bearing Housing and Seal Assembly . If I change it as a assembly bearing / seal / housing would it needed to be shimmed again . I was going to use the old washer , shim and thrust bearing , pinion...
  10. JJB

    2000 Johnson 175 hp cage bearing Maintenance

    I wanted to know how many hrs or often it advised to removed the lower unit prop cage bearing assembly for inspected ?
  11. JJB

    Mer alph 1 Drive Bellows replacement

    I wanted to know how often does the bellows rubber seals need to be replaced on a 1999 mer alph1 drive . My boat was grounded and the lower end was removed for repair the skeg that snapped off . I was thinking I should replace the bellows since the boat is 14 yrs old. Is there other things I...
  12. JJB

    good compression !

    I have a pre mix 2000 175 Johnson on a 20 bayliner trophy wa cutty for about 3 yrs now . It runs good but never been able to get max rpm out of it (Tuned to the max ). I have tired every prop and height and weight and still it's best is around 4700 - 5000 max and thats with throwing every one...
  13. JJB

    Paint Question 20 '1991 bayliner

    I want to paint the bottom of my boat due to 2 week stays in the keys where the boat is in the water all the time . I trailer it and stored the boat in my back yard the rest of the yr . The boat is a 1991 20' bayliner trophy wa good condition , it has never been painted and the bottom is in...
  14. JJB

    175 hp Johnson poping sound

    2000 175 hp johnson carb , I have always been told that a poping sound comes when you are running lean from timming or bad carb adj . I have rebuilt my carbs boat runs good wot but pops at idle or low rpms sometimes . I have adj the carbs like the manual tells you with the boat in the water...
  15. JJB

    bondo and gelcoat

    I know you cant use epoxy but wanted to know if I can use bondo filler under gelcoat . I have a small spot that needs a little fill 3' above the water line in the front of the boat . Will gelcoat bond to it ? thanks for the input ! JJB
  16. JJB

    2000 175 Johnson Battery question

    I am looking for input about using a wet type start / deep cell battery combo for my boat with a 2000 175 Johnson with 35 amp alt with reg. . will my alt and reg charge this type of battery right ? Thanks for the input ! JJB
  17. JJB

    question about compression test on 175 ob

    I was taking a compression test on my 2000 175 Johnson ob . I had 100 lb on the port side and 110 on the strb side . I notice on all three cyl on the strb side had a slight amount of smoke still coming out when I removed the plugs on that side for the test . I had just warm up the motor for the...
  18. JJB

    rebuilt power head

    I need a rebuilt power head for a 2000 Johnson 175 OB . My ob has low compression in 3 cyl and never been rebuilt to date . Should I exchange it or Just have my engine rebuilt ? Does anyone Know who does the best machine shop work for outboards in Florida ? Also if I do go the exchange route...
  19. JJB

    carb tool for a johnson

    I wanted to know if it is possable to adpt a carb stick's tool that are used on multi cyl carbs bikes and cars to syn them . Has anyone has ever done this on a Johnson outboard with multi carb motor ? Thank's for the input ! JJB
  20. JJB

    crankshaft seals

    What is the effect on a Johnson 175 if it had bad cyl crankshaft seals in it ? how could you test crankcase pressure on a cyl ? Thanks for the input . JJB
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