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high pitched hum when im on the gas....

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  • high pitched hum when im on the gas....

    I noticed today that i have a high pitch whine under power, and i can only here it when i give it gas and at lower than 40 mph....after that it gets drowned out by the wind and the kerker exhaust....any ideas? maybe the middle drive? i know that i need to replace my middle drive boot, as it has a gaping hole in it....
    79 XS11 special "Loki" - homemade 4-2 exhaust, pod filters, rebuilt forks with progressive springs, tkat fork brace, progressive shocks, rebuilt all brakes and MC's, rebuilt carbs with #142.5 main and #42.5 pilot, a custom front and chin fairing, and a handmade set of saddlebags....

    09 YZF-R1 " Toothless"

    04 Buell XB12R "Butterfly"

    "I had a name at some point, a birth-name, but now everyone just calls me Wolf...."

    Wolf
    Moto Militia MC

  • #2
    The middle drive boot does have a drain hole in it although it could not be described as Gaping.
    2-79 XS1100 SF
    2-78 XS1100 E Best bike Ever
    80 XS 1100 SG Big bore kit but not fully running yet.
    Couple of more parts bikes of which 2 more will live!

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    • #3
      The whine is probably just the transmission. The straight cut gears make that noise.

      It's normal. You'll get used to the noises.


      BTW....Get a new boot HERE
      Greg

      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

      ― Albert Einstein

      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

      The list changes.

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      • #4
        andreas has a new boot for me...its at least a 50 cent piece hole...so the whine is not me about to detonate anything? lol...
        79 XS11 special "Loki" - homemade 4-2 exhaust, pod filters, rebuilt forks with progressive springs, tkat fork brace, progressive shocks, rebuilt all brakes and MC's, rebuilt carbs with #142.5 main and #42.5 pilot, a custom front and chin fairing, and a handmade set of saddlebags....

        09 YZF-R1 " Toothless"

        04 Buell XB12R "Butterfly"

        "I had a name at some point, a birth-name, but now everyone just calls me Wolf...."

        Wolf
        Moto Militia MC

        Comment


        • #5
          Originally posted by airborneXS View Post
          so the whine is not me about to detonate anything? lol...
          It sounds like a normal gear whine to me. You'll hear it at highway speeds too reflecting off of concrete bridge railings.

          Kinda freaks you out until you get used to it.
          Greg

          Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

          ― Albert Einstein

          80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

          The list changes.

          Comment


          • #6
            Maybe thats the noise I keep mentioning and everyone either shrugs with a confused look or says don't worry about it. It's like a whizzing from the inside. Iguess it really isn't anything to worry about.

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            • #7
              They're noisy engine (mechanically). I would worry about it. Many other bikes, more modern ones too, make an even more pronounced transmission whine. I like the sound!
              XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.

              Comment


              • #8
                Mine makes a sound like a cricket chirping at around 40 mph. I thought it was the speedo cable. Could that also be the trans?
                "Galaxy" 1982 XJ1100J, 1983 XV handlebars, new fusebox, homemade SS wind screen and SS muffler heat shields, homemade grab bar extension and luggage rack. XS750 140 mph speedo, '81 Venture oil cooler, V-Max ACCT, Yahman YICS Eliminator, 1st and 2nd gear Dremel fix.

                Comment


                • #9
                  Originally posted by XJkid View Post
                  Mine makes a sound like a cricket chirping at around 40 mph. I thought it was the speedo cable. Could that also be the trans?
                  That ain't right...
                  Nathan
                  KD9ARL

                  μολὼν λαβέ

                  1978 XS1100E
                  K&N Filter
                  #45 pilot Jet, #137.5 Main Jet
                  OEM Exhaust
                  ATK Fork Brace
                  LED Dash lights
                  Ammeter, Oil Pressure, Oil Temp, and Volt Meters

                  Green Monster Coils
                  SS Brake Lines
                  Vision 550 Auto Tensioner

                  In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                  Theodore Roosevelt

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                  • #10
                    mine too

                    must be a normal thing, cause mine does it too. And i agree with James, i kinda like it myself.
                    Warfman41 1979 xs 1100 F newly aquired...getting it road ready.

                    Comment


                    • #11
                      Whine or hum??

                      Over the years my machine has made both. The whine is normal from the gear mesh in the tranny, mostly in 4th gear on mine. Angle cut gears would quiet this but they are much more expensive and also cause thrust bearing issues so, straight cut gears are the norm.

                      The hum on the other hand can occur with the speedometer cable because the input socket on back of the speedometer needs some lubrication. The hum is caused by the squared portion at end of the cable spinning in the socket at the speedo drive on the front wheel. The cable will break off there but the problem is at the opposite end of the cable.
                      Mike Giroir
                      79 XS-1100 Special

                      Once you un-can a can of worms, the only way to re-can them is with a bigger can.

                      Comment


                      • #12
                        @TADracer I think that I am having this problem. As I was riding home from work yesterday, I noticed a whine/hum from the front end. I found that the speedometer was what was humming since the humming would lessen when I grabbed the speedo and stabilized it.

                        What is the best way to lubricate the speedo and speedo cable?

                        thanks
                        -Andrew

                        80 XS11 G: Project bike

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                        • #13
                          I found that my speedo cable was on too tight.It had been making a humming/growling noise and my first inclination was to grease the end and tighten the "nut" where the cable goes into the speedo. When that didn't work, I loosened it and it stopped.
                          "Galaxy" 1982 XJ1100J, 1983 XV handlebars, new fusebox, homemade SS wind screen and SS muffler heat shields, homemade grab bar extension and luggage rack. XS750 140 mph speedo, '81 Venture oil cooler, V-Max ACCT, Yahman YICS Eliminator, 1st and 2nd gear Dremel fix.

                          Comment


                          • #14
                            Originally posted by Bassman View Post
                            @TADracer I think that I am having this problem. As I was riding home from work yesterday, I noticed a whine/hum from the front end. I found that the speedometer was what was humming since the humming would lessen when I grabbed the speedo and stabilized it.

                            What is the best way to lubricate the speedo and speedo cable?

                            thanks
                            The speedo cable is easy. Take the whole thing off, and remove the inner cable. Take some carb cleaner, and douche out the inside of the outer housing. Take some solvent, and wash the inner off thoroughly.
                            Take some Dri-Slide, or lock lube with graphite, and soak inner and out with it.
                            Reinstall, and you are good to go. It won't act funny in cold weather that way.
                            The speedo is another story, and you can check past posts for methods of doing that.
                            CZ

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                            • #15
                              Hum

                              Mine does it too. I just HUM along with it or turn the radio up! LOL

                              MP
                              1981 XS1100H Venturer
                              K&N Air Filter
                              ACCT
                              Custom Paint by Deitz
                              Geezer Rectifier/Regulator
                              Chacal Stainless Steel Braided Brake Lines
                              Chrome Front Rotor & Caliper Covers
                              Stebel Nautilus Horn
                              EBC Front Rotors
                              Limie Accent Moves On In 2015

                              Mike

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