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50hp 2stroke Yamaha Auto choke not working

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  • #1

    50hp 2stroke Yamaha Auto choke not working

    Hi guys i have just read all on the choke problems and mine is very similar.
    I measured the voltage to the solenoid and it is 6volts.Is this correct??, pulled the solenoid off to find the pin stuck up. Pulled it down and put solenoid back on. No flooding now.
    Is the voltage correct to melt the wax and allow the pin to drop and what resets the pin to the up position once the motor has stopped and cooled. I have priced this part here in Australia $368 none in Australia and only a few ever used. Need help here please.
    Cheers Peter
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  • #2
    take the valve back off.
    measure the pin length.
    hook it up to a 12v battery for a few minutes,it should extend.
    its a wax pellet just like in an old thermostat.

    its powered by the lighting coil output.

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    • #3
      Thanks for the reply. the pin looks like a metal slug. I did pull it out with a pair of pliers, it came out with little resistance. Is this the thing that extends. the voltage measured was 6volts when running is this to low for it to work correctly???.
      I will try the 12v test tomorrow and get back.
      Thanks again Peter

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      • #4
        Thanks for the reply. the pin looks like a metal slug. I did pull it out with a pair of pliers, it came out with little resistance. Is this the thing that extends. the voltage measured was 6volts when running is this to low for it to work correctly???.
        I will try the 12v test tomorrow and get back. What determines the position the pellet should be. When i put it back in it went a long way up the solenoid housing so it was not near the seat. I then pulled it out a ways so when assembled it sat on the seat ,this is obviously not correct given your info, so do i push it fully in as it would have to extend a good 10mm when heating up to seat.
        Thanks again Peter

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        • #5
          I would think you should not have been pulling it out/off.

          You will probably need a new one now

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          • #6
            Originally posted by 99yam40 View Post
            I would think you should not have been pulling it out/off.

            You will probably need a new one now
            My thinking exactly.

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            • #7
              Not having the knowledge i have now I thought it was a pin that moved up/down by the solenoid,thought it was sticking. A little knowledge can sometimes be dangerous.Still would like to know what voltage should be at the solenoid when running, can you help with that thanks Peter

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              • #8
                Stand by. Will advise.

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                • #9
                  Did you measure the voltage at the heater unit with a volt meter set on DC or AC scale?
                  What kind of meter?
                  I believe there is only peak voltage specs listed for the output of the lighting coil that feeds the heater unit.

                  , but putting 12volts DC to it will test it
                  Last edited by 99yam40; 07-01-2015, 10:21 PM.

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                  • #10
                    I tested solenoid today on 12v but couldnot see any movement in the pin.
                    What moves is it the black plastic section below the spring inside the solenoid. I can only assume this moves and the spring returns it whist cooling. The pin in the middle of this must be fixed. Do you know the resistance of the solenoid, mine read about 50k and drew .5amp while I tested it direct to 12v. From this it appears no good, anybody got contacts for a new or good second hand part from a wreck. Thanks again Peter
                    ,

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                    • #11
                      It moves slow you have to measure when cold and when warm. It is not a solenoid.

                      Not sure of your model but this may help...
                      Last edited by greasyshaft; 07-02-2015, 03:12 AM.

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                      • #12
                        Thanks for this mine is a 2009 model I think. But does not relate to what you have shown unfortunately. The extension (a) on mine does not exist. It is up inside the housing shown, I would say by as much as what you show extended. I see a spring around the outer wall about 4coils and then a black plug which the pin is in sunken into that housing.
                        Maybe its a different model but I should imagine all the movements would be the same. Still would like to know the resistance and the voltage to it.
                        Thanks Peter

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                        • #13
                          the pin has pulled out of the plunger.
                          look in the valve housing and see if its there.
                          or the last guy that started ripping stuff apart left it out.

                          your valve assy should look EXACTLY like that picture.

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                          • #14
                            Mine is straight, wiring out the top not like the picture as shown like an elbow.
                            Pin is there but it makes me wonder if the wax pellet is missing I will take a pic tomorrow and post it on here to show what I am explaining. Thanks Guys

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                            • #15
                              Robolt17
                              I think(Iknow) your right there was a pin and plunger in the bottom housing. What tricked me is that there is a pin also in the upper heating part which I had previously mention I had pulled out. I thought this pin extended and sat on which appeared to be a seat in the lower part but this has come apart from the upper and stayed in the lower if all that makes sense. I pulled up a picture of the Carb showing all parts thats when i saw what it was like and what you was trying to show me. Thanks for that its all starting to come together, or maybe its fallen apart haha
                              Cheers Peter
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