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  • #1

    yamaha p50tlrq

    Hey guy i have a yamaha p50tlrq. End 2016 the engine was rebuild because i had a water leak. after rebuild i had a problem with getting engine to run at w.o.t The engine strats up, idles fine, revs up on muffs. but then in the lake the engine strats up and idles fine, but when i go to w.o.t it just bogs out. no power. makes 1k rpms with throlle all the way down.

    mechanic told me my cdi box was theproblem. so i switched it out with a new one. But still i have the same problem.

    the engine strats up like normaal. idles and revs up on muffs. but then at the lake starts and idle. warmings up without any noticabl problems, but going t w.o.t nothing.

    can anyone help what to look at now. i was thinking feul pump. may check prop &hub. exhaust for blockages. other the that

    Guy`s please help any idea
    Tags: None
  • #2
    Could be lots of things, but since your engine was rebuilt, I would at least check the compression in the cylinders. It's possible that the valve clearances are wrong or something else wasn't rebuilt correctly.

    You could also measure the fuel pressure at the pump using a pressure/vacuum gauge, and see if it's within spec. But I would listen to others here first, as I'm certainly no expert.
    2011 F50TLR, 2010 G3 V167C

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    • #3
      1st I would check to see if the timing is advancing.
      make sure all plugs are getting spark and check fuel pressure/vacuum.

      if spark and timing are good, might see if spraying some fuel into the intakes while problem is there to see if the lack of fuel in cylinders is the problem.

      we have no idea what was done in the rebuild

      Scott the P50TLRQ is in the parts here
      could be main jets plugged.

      then the crank seals between the cylinders have to be good along with top and bottom crank seals.
      but that should show up at low RPM also
      Last edited by 99yam40; 06-06-2017, 11:47 AM.

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      • #4
        Q is a 1992

        P = Pro Series

        1992 P50TLRQ Yamaha Outboard CARBURETOR Diagram and Parts

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        • #5
          Yamaha P50TLRQ

          1992 P50TLRQ Yamaha Outboard
          3 cyl
          3 carb engine

          engine rebuild cleaned rings etc
          compression was done. all 3 cyl fine
          carbr where cleaned.
          cdi unit was switched out with new one.
          prime pump, tank to engine hose was replaced.

          only thing i can think of doing is fuel pump and filter. or exhaust blocked.

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          • #6
            Yamaha P50TLRQ

            could it also be reed valve. why? after rebuild i had hard starting problems. and did some research symptoms of bad reed. it was hard starting and down on power. after going tru carbs en new prime pump, hose and water seperator removed. t starts up fine and idle to this day. but the one thing that still is there is down on power/ bogging at w.o.t
            Last edited by Monsanto J F; 06-06-2017, 01:25 PM.

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            • #7
              Yamaha P50TLRQ

              one thing i notice is botom spark plugs where like clean and wet with gas

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              • #8
                #3 power the fuel pump.
                if the pump leaks it dumps fuel into #3 cylinder
                check it to see

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                • #9
                  While a longshot - On another forum a member had similar issue. Idled fine but had no power low rpm at WOT after getting a power head rebuilt. After near endless frustration and near loss of the season, he found the spark advance lever wasn't reconnected.

                  Hope this helps.

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                  • #10
                    Originally posted by 99yam40 View Post
                    #3 power the fuel pump.
                    if the pump leaks it dumps fuel into #3 cylinder
                    check it to see
                    how can i check if the pump is leaking fuel

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                    • #11
                      Take pump apart and see if the rubber diaphragm is damaged, holes or tears...ect. I would rebuild the pump, new diaphragm and gaskets. See the link for your carb posted earlier, I believe it is Itema #42 and #43..two gaskets and one diaphragm.

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                      • #12
                        Okey i check it out weekend

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                        • #13
                          Originally posted by panasonic View Post
                          Take pump apart and see if the rubber diaphragm is damaged, holes or tears...ect. I would rebuild the pump, new diaphragm and gaskets. See the link for your carb posted earlier, I believe it is Itema #42 and #43..two gaskets and one diaphragm.
                          checked out the pump and the fuel pump is okey. no leak and delivering gas to carbs.

                          here is a youtube vid of the problem I have/ I have a yam p50tlrq

                          https://www.youtube.com/watch?v=1HP463ElDAg

                          need help guy`s
                          my yam engine starts and idle all day. but can`t get it past 2k rmps

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                          • #14
                            Is that the right video???

                            Title says Johnson 150, intake silencer says V6, WTH???

                            I have thoughts about that video, if we know what "that's" about



                            Per your description (NOT that video)
                            I agree about the fuel leak into the #3 cylinder as 99Yam pointed out.

                            If the timing hasn't been dinked with, my $'s on the carbs being clogged up.

                            Doesn't take a month of sitting with fuel, un-treated to evaporate and clog the jets. Your's sound like the MAIN jets as your good at idle and just above idle.

                            Main jets should be open and flowing above that...

                            (That is if everything is assembled correctly, linkages, cables, etc)
                            Last edited by TownsendsFJR1300; 06-10-2017, 06:34 PM.
                            Scott
                            1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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                            • #15
                              Originally posted by Monsanto J F View Post
                              one thing i notice is botom spark plugs where like clean and wet with gas
                              Does this mean the bottom 2 plugs are having the same problem?
                              or just the #3 plug

                              also have you checked to see if timing is advancing as it should with a timing light.
                              Last edited by 99yam40; 06-10-2017, 07:20 PM.

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