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  1. #1

    Default Johnson 88 SPL ID by Freeze Plug Number

    Im trying to identify an engine with damaged ID plate to purchase a stator and rectifier. The freeze plug reads G4151785

  2. #2
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    If paint and cowling are original then a picture helps.

  3. #3

    Default Re: Johnson 88 SPL ID by Freeze Plug Number


  4. #4
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Based on your pictures and the guessing that I do , it can only be a 1996 / 97 / 98 model.------Was this thing submerged ?----One thing for sure is the roller in that curved slot needs attention.----Plus a few more things I am sure.
    Last edited by racerone; 06-25-2020 at 03:25 PM.

  5. #5

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Would 96/97/98 have interchangeable parts, it is on a 1996 Crest Pontoon boat but the previous owner was unsure if it was original to the boat. Hasn't been submerged that I know of, I recently purchased it. It runs reliably but is down on power both electrically and horsepower. Voltage sits at 12.6 (external volt meter) and top speed on the 25' pontoon is about 8 mph. Trying to get all the bugs worked out, any suggestions highly appreciated!

  6. #6
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    The trouble shooting on these motors always , always starts with a compression test.---Post your numbers.-----Then test for spark that jumps a gap of at least 3/8" or more.----Post the results of that testing !----Those years I believe are identical for all parts.

  7. #7

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    I did a compression test Bottom Left 101, Top Left 110, Bottom Right 105, Top Right 88. Not great I know... I also cleaned the screen on the fuel pump filter and put some seafoam in the gas tank. Went for a ride afterwards and the boat was intermittently coming to life. The RPM would jump to about 5500 and i would have a lot more power, I got up to 18 mph in very rough water and dirty pontoons. As I drove the lack of power became less and less intermittent. If i lost it I could trim the motor down and "bump" it at its limit and the power would return. Very weird, like a loose connection or something. Thoughts?

  8. #8
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Well ---A new head hasket can be found for $20 on this site.----Do yourself a huge favour and inspect the piston / cylinder with 88 PSI.-----Hopefully a blown head gasket is the only issue.

  9. #9

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    How involved of a job is that? I'm fairly handy and generally handle my own automotive maintenance but I have never had a cylinder head off before. Will I need more than just the head gasket assuming everything else looks good once the head is off?

  10. #10
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    I think 10 bolts and the cylinder head is off.---Easy on a fresh water motor.----So easy I think I could coach the 10 year old grandson to do the job.

  11. #11

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Good deal. Happen to know the cylinder head torque spec?

  12. #12
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    No need to worry about the torque till you are ready to install the head again.

  13. #13

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    What will I be looking for with the head off?

  14. #14
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    You will look for scored cylinder wall.----Perhaps evidence of broken bits of piston rings hammering the top of the piston and the cylinder head.-----Or lucky you if it is a blown head gasket.----Posting of pictures helps here.----Compare one piston to the other one you will see.

  15. #15

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    I pulled the head. The cylinder with low compression looks brand new. The other cylinder is nasty and there are gouges on the head.. check the pics out and help!

  16. #16
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Where are the pictures ?

  17. #17

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Quote Originally Posted by racerone View Post
    Where are the pictures ?
    https://drive.google.com/drive/folde...-n?usp=sharing

    the boat seems to run better once it warms up. Get up to about 4900 rpm and 18 mph but its not reliable, the power comes and goes. Seems to have full power in reverse always. I replaced the rectifier, the old one was blown up and wires melted off. Still not charging well, 12.4-12.7 volts. Wondering if the ignition system is starving for power?

  18. #18
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    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    The picture to me is abundantly clear that this motor needs to be rebuilt NOW.------There is no other fix.----Broken piston rings.----Every one of these motors will suffer the same fate !!!

  19. #19

    Default Re: Johnson 88 SPL ID by Freeze Plug Number

    Anyone want to buy a boat?

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