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1997 GP1200 and WB760 - both need starting spray the first time of day

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  • 1997 GP1200 and WB760 - both need starting spray the first time of day

    The starting spray has the upper cylinder oil added to it. FYI

    If they sit for more than day (with battery charger on) and I try to start them by pulling the choke, I can crank and crank and crank they won't start.

    but if I do a quick squirt of spray they start right up and stay running.

    I'm thinking the diaphragms in the carbs need to be replaced, since the carbs act like their own fuel pumps....am I right in thinking that.


    once started and run, they start right up for the rest of the day....but without the starting fluid, I wouldn't be able to do that initial start.
    1986 Offshore (OSY) CC 21', 1986 Evinrude 225 hp

  • #2
    Hi

    two things I’d say.

    1 don’t use starting spray on these. You are running briefly without lube from the 2 stroke.

    2. Most common cause of this is usually a failed check valve in the line from the tank. Some folk get lazy and around it by fitting a primer pump in the fuel line. Sometimes works, but danger is blowing the diagram with this.
    You might find that if you pull the choke on...turn her over with throttle pumping...she will kick. Turn choke off and turn over with throttle and catch her. Might just do the trick.

    Comment


    • #3
      ok cool...
      1 - The starting spray has the upper cylinder oil added to it. (not sure why it took them so long to add that)
      2- this check valve do you have a picture or a part number or area to look for it?


      UPDATE: is it this part?

      Check Valve
      EU0-67767-31-00

      from this diagram
      https://www.yamahapartshouse.com/oem...2cca/fuel-tank
      Last edited by cfauvel; September 21st, 2019, 09:09 AM.
      1986 Offshore (OSY) CC 21', 1986 Evinrude 225 hp

      Comment


      • #4
        Yeah. Part 15.
        Small chance of it probably, but thought I’d mention. It’s very easy to get the fuel filter direction wrong. Very common mistake. At first glance you think the fuel travels a certain way. But it actually goes the opposite way from what you would naturally think when just looking by eye. These filters are one direction only.

        But usually the check valve or a leak somewhere that causes your issue. Very easy to check

        Comment


        • #5
          Originally posted by QBhoy View Post

          But usually the check valve or a leak somewhere that causes your issue. Very easy to check
          ok novice with these things, how to easily check?

          I'm guessing the idea is that the valve allows fuel to fill up the line to the carbs, then prevent the fuel from flowing back to the tank.

          So having a bad check valve, the vacuum pulse of the engine is not enough whilst cranking, but is enough to draw fuel once started.

          UPDATE: looking at where that check valve is and following the lines, it appears to be an AIR check valve, is that right?

          So it has been two days since last started, looked at the fuel filter assembly and saw it was full of fuel, tried the recommended steps to start GP1200 from QBhoy (pull choke, crank whilst throttling up), it caught and stalled, pushed the choke in and re-tired and it started fine. Tried the same on the WB760 and it too started fine.

          Next step is it wait longer and re-try.
          Last edited by cfauvel; September 22nd, 2019, 01:03 PM.
          1986 Offshore (OSY) CC 21', 1986 Evinrude 225 hp

          Comment


          • #6
            Originally posted by cfauvel View Post

            ok novice with these things, how to easily check?

            I'm guessing the idea is that the valve allows fuel to fill up the line to the carbs, then prevent the fuel from flowing back to the tank.

            So having a bad check valve, the vacuum pulse of the engine is not enough whilst cranking, but is enough to draw fuel once started.

            UPDATE: looking at where that check valve is and following the lines, it appears to be an AIR check valve, is that right?

            So it has been two days since last started, looked at the fuel filter assembly and saw it was full of fuel, tried the recommended steps to start GP1200 from QBhoy (pull choke, crank whilst throttling up), it caught and stalled, pushed the choke in and re-tired and it started fine. Tried the same on the WB760 and it too started fine.

            Next step is it wait longer and re-try.
            Excellent. That’s exactly the way I used to start my Yam GP800r and it’s pretty much the universal trick. Choke on....crank whilst pumping throttle. It will kick. Choke off...crank again and catch it on the throttle. Always worked for me.

            Comment


            • #7
              Our local dealer has put a primer on these since they first came out. A squirt of fuel seems to make them happy.

              Comment


              • #8
                UPDATE: went out Saturday. Before we left the house started them, and they started right up with very little effort and no hiccups at all during the whole day.

                On Sunday I tried to start the red one and it took a lot to get it started , pull choke, crank squeeze trigger, push in choke crank, squeeze trigger....over and over , until it finally started (no starting fluid used)

                I'm on the fence on putting on a primer system.
                Last edited by cfauvel; October 1st, 2019, 08:34 AM.
                1986 Offshore (OSY) CC 21', 1986 Evinrude 225 hp

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                • #9
                  Just put a proper one on it then. Some put an outboard bulb primer on them. They blow the wee fuel pump to bits.

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                  • #10
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                    Originally posted by QBhoy View Post
                    Just put a proper one on it then. Some put an outboard bulb primer on them. They blow the wee fuel pump to bits.
                    I wonder if a 2 stroke edger primer (clear bulb that you push) would be enough to fill the carbs. I mean there isn't much volume in them,
                    1986 Offshore (OSY) CC 21', 1986 Evinrude 225 hp

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