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what is this red looking valve on my 87 v4 90hp?

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  • what is this red looking valve on my 87 v4 90hp?

    So, i changed the plugs on my new to me motor earlier from a set of ones that the guy said were fouled...put the water muff on, and tried cranking...the motor would crank, and start with me pushing in on the key and the neutral idle all the way up, but as soon as I let go, the motor would shut off. We ended up speaking to a buddy of my dad, and he fooled with this valve on the top back side of the motor that turns (its a red triangle looking valve) and looks like it has fuel lines and electrical wires....when he turned this, the motor fired right up and idled on its own....when he would turn it back the other way, the motor would die. What is this valve? it has a picture next to it showing an arrowing turning it, but im not sure what this does?? thoughts??


  • #2
    Re: what is this red looking valve on my 87 v4 90hp?

    ok...so with researching it sounds like something called a primer solenoid?? why would turning it to the outside of the motor cause the motor to idle fine on its own, but turning it in toward the motor causes it to not want to run?

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    • #3
      Re: what is this red looking valve on my 87 v4 90hp?

      The red lever is the manual override for the primer solenoid. By holding the key in you were doing the same thing as moving the lever and you were bypassing the carbs. Sounds like you got some gummed up carbs.

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      • #4
        Re: what is this red looking valve on my 87 v4 90hp?

        so what is recommended? thats odd...if it were doing the same thing, it seems like it would run if I kept the key held in right? It would run a sec with the key held in, but would die eventually (even with it held in). Also...does anyone have any idea what a knob in the throttle area might be? I just have a knob on my console / throttle area with no writing or nothing on it...its right next to my kill leash, and below my neutral throttle lever on the console area...not sure what that little knob does...I didnt notice it doing anything when turning it though.

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        • #5
          Re: what is this red looking valve on my 87 v4 90hp?

          By.

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          • #6
            Re: what is this red looking valve on my 87 v4 90hp?

            If the carbs are varnished it may not stall
            from choking it, it needs the gas.
            Running with lever rotated is choke on.
            Little black knob sounds like throttle friction adjustment?
            Recommendation, clean carbs, replace fuel filters,
            and check for water in gas.

            Comment



            • #7
              Re: what is this red looking valve on my 87 v4 90hp?

              Time to clean the carbs.
              The choke or in this case the enrichment valve allows fuel to bypass the carbs and puts fuel directly into the throats thereby allowing the motor to run. In addition you could have a bad valve as indicated by the motor not running with the switch held in and only running in manual position.

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              • #8
                Re: what is this red looking valve on my 87 v4 90hp?

                so, is cleaning the carbs pretty easy? does pressing in on the key regulate that valve or something?

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                • #9
                  Re: what is this red looking valve on my 87 v4 90hp?

                  Don't do anything. Set the knob where the engine runs. That's the correct setting. This knob is used ONLY in the event you end up with a dead battery and need to rope start the engine. With a dead battery the primer solenoid would not operate so you would pull your arm off without the engine starting. Flipping the lever AND squeezing the primer bulb a couple times PRIMES the engine and it will not rope start. The reason the engine won't run with the lever flipped to the MANUAL position is because it is being flooded with too much fuel -- not because the carbs need rebuilding.

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                  • #10
                    Re: what is this red looking valve on my 87 v4 90hp?

                    Thanks. that's very helpful. which way is which? point out away from the engine and pointing toward the engine. the little knob is triangle shaped and red. do these motors have a rope? I haven't noticed one???

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                    • #11
                      Re: what is this red looking valve on my 87 v4 90hp?

                      straight down on mine,or fartherest clockwise, no you provide the rope.
                      sigpic[FONT="System"][/. ase master tech

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                      • #12
                        Re: what is this red looking valve on my 87 v4 90hp?

                        Originally posted by stylesabu View Post
                        straight down on mine,or fartherest clockwise, no you provide the rope.
                        point down for which type of operation? ?

                        Comment



                        • #13
                          Re: what is this red looking valve on my 87 v4 90hp?

                          Click image for larger version

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ID:	90196Click image for larger version

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ID:	90197run according to my owners manual,not service manual. i think silvertip meant with arm /level moved to manual you will be able to pull start. this is supposed to adjusted or moved, only when engine is needing to be pull started. but I would like to know why there is a scrader valve in it,under cap? hope pictures help
                          sigpic[FONT="System"][/. ase master tech

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                          • #14
                            Re: what is this red looking valve on my 87 v4 90hp?

                            http://www.outboardrepairs.com/topics/007943.html

                            I found this link above....counter clockwise / clockwise (up and down) could also depend on how you are facing the motor when describing...I guess im just curious which way is primer off and which way is on.

                            The picture on the motor itself doesnt really show which way is run (i guess manual prime off), and which way is prime on. If standing on the side of the motor with the primer switch, (which would be on the right side, with prop facing you) should the lever be pointing away from you (toward the flywheel of motor), or toward you away from engine?

                            Comment



                            • #15
                              Re: what is this red looking valve on my 87 v4 90hp?

                              found this....http://www.*****************/boat-for...g-the-greatest

                              this helps alot...so now, with the lever over top of the solenoid the motor doesnt want to start...it will crank, and run for a second priming and cranking with the key, but as soon as I left off, it wants to die....and sometimes dies on its own..

                              if we opened the solenoid (with the lever facing away from the solenoid - manual open)...it would crank right up and idle on its own)

                              what does this mean? where should I look next??

                              Comment


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