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  • #16
    The pilots on BS34 carbs have both fuel and air.
    True, further out is "richer".


    Carb fuel diagram

    http://www.xs11.com/forum/showthread...t=carb+diagram
    _______________

    I'd check if 1,3 & 4 are getting spark. If not then most likely a wiring issue with the new coils.

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    • #17
      As a side note
      2 1/2 turns out with stock exhaust and air box is a lot.
      Could be right but most are in tune 1 to 2 turns out.

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      • #18
        Originally posted by mro View Post
        As a side note
        2 1/2 turns out with stock exhaust and air box is a lot.
        Could be right but most are in tune 1 to 2 turns out.
        That sounds more like earlier 78/79 carbs where 1-1/4 turns out is recommended. Where I am here at about 1400ft above sea level 3 to 3 1/4 turns out works for me .
        BDF Special
        80SG Vetter bagger 1196 Wiseco big bore kit, Mega Cycle Cams, slotted cam gears, ported and flowed head, bronze intake seats, Dyno Jet kit, Dyno coils and Mikes XS air pods, Venture cam chain adjuster,Geezer's regulator, Clutch mod, Mac 4 into 1 with custom built and tuned baffle, Oil cooler,MikesXS emulators mod.
        Dyno tuned to 98 hp at the rear wheel.

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        • #19
          There is no real "set in concrete" setting for the idle mix screws. Too many variables with each motor; compression, valve adjustment, sync, etc. 1500ft. amounts to no elevation really. I'm at 5,000ft. and have run mine 3.5-4 turns out and with a different float level setting have them at 2 turns out and everything from here goes UP before it comes DOWN. That UP is over 10,000ft. also. Also ran mine 10yrs. from new at 6,500ft. elev. and UP jsut the way it was when I rode it off the showroom floor. It ran perfect ALL the time back then, but there's something to be said for the fuel then too. Set fuel mixture warmed up from riding by "ear". Ken Talbot's "how to" may be of help for you. With the YICS setting the idle mix and sync. is a bit of a pain, but your scoot will thank you for it in performance.
          81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

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          • #20
            Question on the original subject

            Which coils did you get? If they are the green ones (which are very common)then they are 3 ohm impedance coils. You will need to remove the ballast resistor with these or you will get a very weak spark that can make your bike act exactly like what you say.
            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.

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            • #21
              Originally posted by TADracer View Post
              Which coils did you get? If they are the green ones (which are very common)then they are 3 ohm impedance coils. You will need to remove the ballast resistor with these or you will get a very weak spark that can make your bike act exactly like what you say.
              he has an XJ, no resistor to remove.
              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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              • #22
                dyna coils

                evidently i did'nt do a good job crimping the o-connectors, the wires pulled out easily went to o'reillys got some better ones. that fixed it. thanks all for your input,you guys rock!!!!! terry

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