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Suprize, the carb boot is smaller than the carb

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    #1

    Suprize, the carb boot is smaller than the carb

    Take a look inside your OEM carb boot and see if it's smaller than the throttle plate cause mine sure is. I don't know if it's old age or what but it's like having a NASCAR restricter plate. I been checking into bigger carbs, but with these boots I don't think it will help my performance with bigger carbs. Going to replace them with some straight rubber hose soon.

    Jake
    1166cc 1/8 ET 6.09@111.88
    1166cc on NOS, 1/8 ET 5.70@122.85
    1395cc 1/8 ET 6.0051@114.39
    1395cc on NOS, 1/8 ET 5.71@113.98 "With a broken wrist pin too"
    01 Sporty 1/8 ET 7.70@92.28, 1/4 ET 12.03@111.82
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    #2
    Thanks for the heads up. I am going to look next time I'm out at the garage.

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      #3
      The inside of the boot is smaller than the opening at the inlet end of the carb, but if you measure the smallest part of the throat, down inside the carb, I think it is smaller than the boot. Just my opinion!!!

      Comment

        #4
        The inside of the boot is smaller than the opening at the OUTLET end of the carb.

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          #5
          Radiator hose 'nuf sed.....

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            #6
            Just remember that if you replace the boots with anything other than the same type of boots you may not be able to properly sync your carbs.

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              #7
              Don't use radiator hose, the ID of the hose will be larger tha that of the carburetor outlet and the intake tubes.
              Result: you'll get turbulence around these places.
              Better to grind out the original rubbers to match the carbs/intakes.
              This way all the fuel mixture sees is a smooth tube effectively guiding it down to the combustion chamber.

              Comment

                #8
                Originally posted by biker66
                Don't use radiator hose, the ID of the hose will be larger tha that of the carburetor outlet and the intake tubes.
                Result: you'll get turbulence around these places.
                Better to grind out the original rubbers to match the carbs/intakes.
                This way all the fuel mixture sees is a smooth tube effectively guiding it down to the combustion chamber.


                Agreed.

                Before doing any such thing, consider the composition of the hose/tube to be used.

                Rubber does not work well, or for very long, with gasoline, whether it is liquid of vapour.

                The rubber will dissolve, and it will go into, but not necessarily through, your carburetor.
                Bertrand Russell: 'Men are born ignorant, not stupid. They are made stupid by education.'

                ​

                Comment

                  #9
                  Thanks for the info, I'll just grind out the OEM boots.

                  Jake
                  1166cc 1/8 ET 6.09@111.88
                  1166cc on NOS, 1/8 ET 5.70@122.85
                  1395cc 1/8 ET 6.0051@114.39
                  1395cc on NOS, 1/8 ET 5.71@113.98 "With a broken wrist pin too"
                  01 Sporty 1/8 ET 7.70@92.28, 1/4 ET 12.03@111.82

                  Comment

                    #10
                    Pish Posh..... I've been running radiator hose for over 2 years now and had no trouble with deterioration or syncing carbs. Yes there is a huge size difference between the outlet of the carb, to the hose, then to the intake. So what. Just because there is a size difference doesn't mean I'm losing velocity. It could also be argued that the extra turbulence keeps the air and fuel mixed properly instead of condensating on the smooth surface of a tube. I don't necessarily believe this, but some folks do. I like to think of the radiator hose like a capacitor in an electrical circuit. Storing energy (A/F mixture) for a short time then releasing it in a great burst upon demand. I believe it helps smooth out the pulsing normally found in the intake tract, causing a smoother draw through the carbs.


                    Goggles........................Check
                    Gloves..........................Check
                    Asbestos underpants......Check

                    FLAME ON!!!

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