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  1. #1

    Default 1988 dt150 wont go

    1988 dt150 wont go after putting in gear, usually dies. runs/revs fine out of gear. idles a little low and rough. has good compression on all cyl's, new plugs, new fuel filter. its on a 24 foot pontoon. any help would be appreciated. thx

  2. #2
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    13,660

    Default Re: 1988 dt150 wont go

    All motors rev just " fine " in nuetral.------Do you have spark on all leads ?

  3. #3

    Default Re: 1988 dt150 wont go

    not sure, how would i check that while putting in gear?

  4. #4
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    13,660

    Default Re: 1988 dt150 wont go

    No need to put it in gear for that sort of test.

  5. #5

    Default Re: 1988 dt150 wont go

    Ok. Can I use a timing light to verify spark?

  6. #6
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    13,660

    Default Re: 1988 dt150 wont go

    That is one way to do it.---------Spark tester is best way.

  7. #7

    Default Re: 1988 dt150 wont go

    Ok thx for the help. I will post the results as soon as I can. Boat is 20 minutes away at the marina. Anything else I could check while I'm there?

  8. #8
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,707

    Default Re: 1988 dt150 wont go

    Pull one plug lead at a time with plastic pliers while she's running, If you get no rpm drop on a cylinder,you found the non running one

  9. #9

    Default Re: 1988 dt150 wont go

    well I went to the marina yesterday to run a few tests and pull the carbs and something else went wrong. I checked for spark on all 12 wires and all was good. ran a compression check and all cylinders had 120 psi. while checking for spark it was idling a little high then it started shifting/banging into gear on its own without touching the controls. did this a few times then it stopped but I couldn't make it go into gear with the controls. it also stopped pumping water so my beast guess is something happened to the lower unit. I'm going to get it back home this weekend and pull the lower unit.

  10. #10
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,707

    Default Re: 1988 dt150 wont go

    Pull plugs and see if engine can be rotated by turning flywheel by hand, If not time to pull l/unit

  11. #11

    Default Re: 1988 dt150 wont go

    driveshaft broke so I sold it.

  12. #12

    Default Re: 1988 dt150 wont go

    check water in vapor separator

  13. #13

    Default Re: 1988 dt150 wont go

    Quote Originally Posted by johnnygjr View Post
    Pull plugs and see if engine can be rotated by turning flywheel by hand, If not time to pull l/unit
    Thanks for the tip, worked like a charm!

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