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I'm puzzled/ power loss when warmed up

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  • I'm puzzled/ power loss when warmed up

    It's more then the title says but in a nutshell my 01 midnight star backfires and loses almost all power and can barely get out of it's own way when it's warmed up.

    When it's cold, it starts right up, idles nice, revs nice...I can take it out for a couple of blocks but after that it just starts cutting out on what feels like one cylinder. New plugs two seasons ago, 30k miles. Right before all of this started I had washed and dried the bike the way I've done it for years. This was two weekends ago, if something got wet (doubt it) it's dry by now.. could a coil be bad and only testable when warmed up? same with wires and plugs? stator? .. Also, any chance the valves might just need adjusted? opinions on where to start looking?

    Ryan

  • #2
    From the Four Corners area, northwest New Mexico.
    Check your fuel filter and the the vent on the fuel tank.

    Comment


    • #3
      from Solon, IA

      Does it run rough when warmed up like it's only firing on one cylinder? Or as Duke suggested, does it feel like it's starving for fuel?

      Comment


      • #4
        I'll check it out. Thanks guys, I was a part of this group for quite a while, same name, etc. I had to re-sign for some reason, none of my sign in or email addresses would work anymore.

        Comment


        • davej
          davej commented
          Editing a comment
          This is the new RSC the original RSC closed down and was resurrected by Rock River Powersports. We all signed in again.

      • #5
        I also noticed when this is going on the fuel guage isn't registering until I key the bike off and restart it

        Comment


        • #6
          and yes, it totally acts like starved for fuel but only when hot? Where is the vent line run to?

          Comment


          • Duke
            Duke commented
            Editing a comment
            Vent runs from the top of the fuel tank by the ignition key switch, to the down tube part of the frame at back of motor. There is a rollover valve that plugs up and I'd just remove it into the trash can.

        • #7
          Does it idle rough when warm? Maybe sticky valve syndrome?

          Comment


          • #8
            negative, and the fuel filter seems fine. Crack the gas too far too quick and it bogs out, blip the gas and similar results. medium throttle aggression results seem perfect all the way through the rpm range. . was just about to sell the thing too and try to look for an 07 or so 1700

            Comment


            • #9
              Road Stars don't like to be blipped.

              Comment


              • #10
                Agreed, that was a characteristic comparison. I've had this about ten years, never been into the carb, I was mostly cyrious if anybody had the opinion that this was ignition related and/or testable while cool.

                Comment


                • #11
                  Coils act up only when hot. Something to look into. JC

                  Comment


                  • #12
                    When the engine cough's ( intake backfire) the flame hits the plastic slide in the carb throat, see how it feels by lifting it with your finger, if it isn't perfectly smooth polish it with#0000 steel wool

                    Comment


                    • #13
                      Tearing it apart tomorrow, might have to start throwing parts at it, the fuel filter has been on for the 10 years I've owned it but sees a limited amount of ride time.Fuel is always cold weatherized and always has a cool weather tender on it. Where would there be an ignition be located? I was told the ignition had been upgraded somehow when I bought it but the seller was unaware of what was done.

                      Comment


                      • #14
                        I gave up, valves need adjusted anyway....I took it in to Dillon Brothers in Omaha Ne. 1 month wait. I may turn right around and get a trade in price on it. Thanks for the help guys.

                        Comment


                        • Chromepony
                          Chromepony commented
                          Editing a comment
                          If you're gona' trade, trade up.
                          Look around & see if you can find good deal on a 'Liner. At least ride one before you pull the trigger on a trade.
                          You won't regret it.

                      • #15
                        Oh, bummer, good looking bike. What is trade in value? where are you located?
                        It's not that life is so short, it's just that you're dead for so long.---unknown.

                        Comment


                        • Oldsguy1
                          Oldsguy1 commented
                          Editing a comment
                          I'm just outside of Lincoln Ne. I paid a whopping 3,700 bux for it 10 years ago and at the time it needed a rear tire and battery. 'm sure to be better off selling privately but an easy trade-up situation is faster (like it matters, there'll be snow on the ground by then. It is definitely dated but rides and performs perfect until this little hickup.

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