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  1. #1
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    Compression info on my 1989 Johnson GT 150 (model #J150STLCEM)

    Gonna do a compression check on my motor.....running like crap, like it's missing or not firing all cylinders. Someone told me that this model motor was lower compression from the factory, 80-90 compression. Does anyone know if this is true? What is the acceptable range of compression for this motor?

    Thanks,
    Jason
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

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    #2

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    i have a 1990 johnson gt 200 with 88lbs at each cylinder. Championman told me its A OK. As long as their all within 15% of each other your good.

  4. Sprint Boats Moderator Bassmeister's Avatar
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    #3

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    Gauges will vary, as long as the 6 cylinders are within 10-15% of each other you should be fine in the 80-90 range.

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    #4

    Re: Compression info on my 1989 Johnson GT 150 (Bassmeister)

    punt66 and bassmeister,

    THANKS for the info. Going to do compression check now. You two are fast!!!!Thanks!!
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

  6. Member DoferGofer's Avatar
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    #5

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    The compression on my 1985 is in the 85 - 90 Range and it runs just fine although, you can expect it to be a gas hog because it loves the stuff. One other thing you might consider is a leak-down test to see if all cylinders are less than 10% leak-down

    Regards,



    If you can't run with the big dogs, just stay on the porch.

    Model E150DPLIIB, Serial 05311818, Mfg Date 02/2011

    SST... 14 1/2" x 19" 45.0 mph.@4950
    Rebel 15 1/2" x 17" 45.1 mph.@5250
    Rebel 15 1/2" x 16" 44.6 mph.@5300 (Re-pitched/Balanced/Blue Printed by Mark's Props)
    Rebel 15 3/4" x 15" 44.2 mph.@5700-5750

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    #6

    Re: Compression info on my 1989 Johnson GT 150 (Bassmeister)

    OK......compression check results. I'll list the 6 cylinders from top left to bottom right.

    1. 98 4. 95
    2. 98 5. 91
    3. 95 6. 88

    Here's some info on how it's running. Idles very high when in neutral; when I backed it off the trailer and started forward, absolutely no power when increasing throttle. It started to bog and run very rough immediately. Guessing at speed, but runs 10-15 MPH at full throttle, and rough.

    Thankfully, compression seems good, so what should I go after next? Last week, I took the 3 carbs off, cleaned the jets with a tiny piece of wire and carb cleaner, and re-installed. Needle valves all looked good. Should I have done anything more to the carbs? Is a carb repair kit or rebuil much more than what I did?

    Thanks,

    Jason
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

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    #7

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    have you changed your fuel filter? Changed plugs?

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    #8

    Re: Compression info on my 1989 Johnson GT 150 (punt66)

    Changed both. Owners manual called for a Champion plug QUL77......all I could find at the auto parts was a QL77. Checking with my local marine store to verify correct plug.
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

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    #9

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    Verified QL77J4C is the correct plug.
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

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    #10

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    championman i am sure will have some advice for you. He is a moderator here and very knowledgable. You just purchased the boat? Has it run well at all since you purchased it?

  12. Sprint Boats Moderator Bassmeister's Avatar
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    #11

    Re: Compression info on my 1989 Johnson GT 150 (punt66)

    Very good questions Punt. All the info we can get the more we can help.

  13. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #12

    Re: Compression info on my 1989 Johnson GT 150 (Bassmeister)

    If you've gone through all that on your GT-150 and it won't get going, I'd suggest that after the carb going through that you check your carb linkage and make sure the plates are all opening up together. The cross flow carbs have a linkage that runs between the upper,mid,lower with a half moon linkage on the center carb. The Center carb's cam follower controlls the throttle plates opening and closing provided the linkage is correct.
    On the middle carb there is a roller on the cam that has a phillips head screw on it with a black plastic roller that should have a clear roller over it. The clear part of the roller should be touching the short embossed (raised) mark on the Cam. If the clear cover is missing order a new roller assembly or take a 3/8" id piece of clear hose and install it over the black roller. Adjust it so the center roller touches the cam and make sure the plates open a WFO.

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    #13

    Re: Compression info on my 1989 Johnson GT 150 (ChampioNman)

    Thanks.........I know what you're describing and will verify in the morning. The carb linkages on this motor were very easy and uncomplicated, compared to some of the "war" stories from other members. If the power pack were bad, how would the motor operate?

    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

  15. Sprint Boats Moderator Bassmeister's Avatar
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    #14

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    Usually no fire on one side, could be one or all cylinders on that bank.

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    #15

    Re: Compression info on my 1989 Johnson GT 150 (Bassmeister)

    So if cylinder compression is good, cylinder is firing.........correct?
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

  17. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #16

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    Not all the time, at timing light would verify that. Move the lead to each cylinder and shine it at the block.

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    #17

    Re: Compression info on my 1989 Johnson GT 150 (ChampioNman)

    OKAY......here's the latest. Carbs cleaned and linkages are synchronized. Compression test was good. Just did a spark test to see if I was getting fire to all the cylinders. The right bank of 3 cylinders all have good spark. On the left bank, the middle cylinder (I'll call it the #2 cylinder) has NO spark at all, the top and bottom cylinders have good spark.

    What should I troubleshoot next, the spark plug wire, the power pack, etc......?
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

  19. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #18

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    Swap coils with that cylinder and see if it follows the coil.

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    #19

    Re: Compression info on my 1989 Johnson GT 150 (ChampioNman)

    It didn't follow the coil, so I took it that the power pack was bad. New power pack ordered and on the way. I'll let you know the final outcome. I, along with everyone else I'm sure, really appreciate the help and direction that guys like you provide. THANKS!
    Jason --- 1985 Stratos 385V - 1989 Johnson GT 150 (Model #J150STLCEM)

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    #20

    Re: Compression info on my 1989 Johnson GT 150 (new"old"boat_owner)

    I just had a problem similar to yours. The middle cylinder on the left side of the motor was not producing spark. It ended up being the timer base wires were wore through and grounded the one cylinder and damaged the power pack. It took me two power packs to find this out.

    Trent

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