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1990 Yamaha 200 hp waterflow/overheat problem

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  • 1990 Yamaha 200 hp waterflow/overheat problem

    Can anyone give me advice on a waterflow/overheat problem with my 1990 Yamaha. The last time I used it there was no overheating issue. I start it up every couple months to get the gas flowing through the carbs and it starts fine. The problem is no waterflow and it overheats. Here is what I have done:
    - I replaced the thermostats so that should not be an issue
    - I pulled the poppet valve and both the valve and spring look good
    - I started it up with both the poppet valve and thermostats out and covers off and there is no water flowing up this far.

    I am thinking water pump but before I take the lower unit off I wanted to get some advice on if I am on the right track or are there other suggestions.

    thanks for taking a look

    Kevin

  • #2
    Re: 1990 Yamaha 200 hp waterflow/overheat problem

    Anybody??? Someone has to have some suggestions or ideas???

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    • #3
      Re: 1990 Yamaha 200 hp waterflow/overheat problem

      i would say waterpump, you may also hook a old garden hose(end cut off) to the watetube extending down the center section, check flow, that will eliminate any other variables

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      • #4
        Re: 1990 Yamaha 200 hp waterflow/overheat problem

        Thanks Ernie. I did as you suggested and have good flow up through the thermostats. I pulled the water pump off and the impeller looks good but I guess I will do a full water pump replacement and hope that does it. I will let ya know.

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        • #5
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          Re: 1990 Yamaha 200 hp waterflow/overheat problem

          With lower unit and thermostat housings off, push water through the thermostsat canal to backflush anything that may be in the engine.. it can only help and will dump water out the tube below. I also connected the garden hose ears to the lower unit and ran water with the water pump off to clear anything in that area as well.

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