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  • no muffler question

    K so my bike was running rich, it would get hot and just bog out and die .....My new (stock) jets came in today and i installed them, bike no longer richens out and dies but it seems to sputter at a constant throttle at any speed .....bike does not hesitate while acelerating but it back fires while off the trhottle and down shifting .....This bike has straight pipes on it (not by me by the previous owner) would installing mufflers solve my problem??
    1980 XS standard With Pods and Harley mufflers

  • #2
    its hard to say but in most cases yes it should help because most engines need some back pressure to run properly. also stock jets are not right for straight pipes. i have pod air filters, accell coils (3 ohms) and wires, mac exaust, i am running 138 main jet, 42.5 pilot jet, 180 air pilot jet, needle is in the middle, and float hight is as close as i can get to 25.7mm, and about 2-2.5 turn out on the pilot screw. i don't know what the stock jet numbers are?
    79' XS1100SF

    Comment


    • #3
      exaust

      I had mac 4 to 2 pipes when I bought my bike, poped and backfired bad! tuned, rebuolt carbs, helped some. Changed to OEM exaust, prob gone, runs great, no pop or backfire anymore. Everthing else has to be right, but the OEM exaust makes it all sing IMHO
      1979 XS1100 Special (Mad Max, OEM) Current
      1980 XS1100 Special
      1990 V Max
      1982 KZ750 LTD Twin
      1986 700 FZR Yamaha Fazer (faster then expected)
      1979 XS750 Special (my 1st Special)
      1974 CB750-Four



      Past/pres Car's
      1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

      Comment


      • #4
        I've never tried it, but more than a few pretty knowledgable folks have coe on here trying to figure out how to get these bikes to run decent with open exhaust. I do not know of any that succeeded without putting some kind of baffle in place.
        Life is what happens while your planning everything else!

        When your work speaks for itself, don't interrupt.

        81 XS1100 Special - Humpty Dumpty
        80 XS1100 Special - Project Resurrection


        Previously owned
        93 GSX600F
        80 XS1100 Special - Ruby
        81 XS1100 Special
        81 CB750 C
        80 CB750 C
        78 XS750

        Comment


        • #5
          It's a PITA...

          like everyone say's, these bikes need backpresure of some sort.

          this is what i did.

          How to make HD pipes work on a xs1100.doc
          http://www.megaupload.com/?d=SV97O793

          i still had to bump to bigger jetting.

          my stock pilot jet is a 42.5, i'm running 45.0 (2.5 turns out on the needles)
          stock main is a 137.5, I'm thinking 2 higher would be about right.(142.5)

          BUT!!! that is for my setup.

          you may need to adjust from there.

          also see here: http://www.xs11.com/forum/showthread.php?t=382
          for jetting recomendations.

          good luck

          also georgefix(ebay) is the man to get jets from.
          very good to deal with and Very reasonable prices.
          1979 XS1100SF Special.78 E motor/carbs, Jardine 4-2 exhaust, XS Green coils, Corbin seat, S.S. Brake lines, Hard cases, Heated grips.
          1981 Yamaha XJ750RH Seca (War Pig) XS11S front end and rear swingarm with 17" rim, 20mm ammo box saddle boxes, HID headlight, LED aux lights, Heated grips & seat, Bark busters, Harley 12" shocks, S.S. brake lines, oil cooler

          PW50, PW80, YZ80(mine? what the??? Brrap OH...)

          Most bike problems are caused by a loose nut connecting the handlebars and the seat!!

          Comment


          • #6
            Cool

            Originally posted by MindWebs View Post
            It's a PITA...

            like everyone say's, these bikes need backpresure of some sort.

            this is what i did.

            How to make HD pipes work on a xs1100.doc
            http://www.megaupload.com/?d=SV97O793

            i still had to bump to bigger jetting.

            my stock pilot jet is a 42.5, i'm running 45.0 (2.5 turns out on the needles)
            stock main is a 137.5, I'm thinking 2 higher would be about right.(142.5)

            BUT!!! that is for my setup.

            you may need to adjust from there.

            also see here: http://www.xs11.com/forum/showthread.php?t=382
            for jetting recomendations.

            good luck

            also georgefix(ebay) is the man to get jets from.
            very good to deal with and Very reasonable prices.
            Cool, glad you got it to work that way. 2 1/2 turns on needles? Is that what just ran best or did your tunning make you chose that rich?
            1979 XS1100 Special (Mad Max, OEM) Current
            1980 XS1100 Special
            1990 V Max
            1982 KZ750 LTD Twin
            1986 700 FZR Yamaha Fazer (faster then expected)
            1979 XS750 Special (my 1st Special)
            1974 CB750-Four



            Past/pres Car's
            1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

            Comment

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