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    choke question

    i want to re-jet my bike, because i prefer a slightly rich mix over the lean mix that my bike has.
    can i used the choke at say, 1/4 on to achieve the same result (enriching the mix) until i can do the job properly?
    1985 Suzuki GS450L

    #2
    No.....you’ll mess up how the vacuum diaphragms react as you increase load.
    does PA require a bike emission test?
    If your carbs are properly cleaned, bike will run correctly with original air box/filter setup
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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      #3
      PA does not require emissions testing at annual inspection for motorcycles. Other vehicles may require emissions depending on the county in which they are registered.

      Are you looking for the latest emissions testing requirements in Pennsylvania? This guide has all of the regulations and testing locations for you to get your car tested. Click to find the location near you. Find addresses, hours of operation and phone numbers of testing stations near you.
      Rich
      1982 GS 750TZ
      2015 Triumph Tiger 1200

      BikeCliff's / Charging System Sorted / Posting Pics
      Destroy-Rebuild 750T/ Destroy-Rebuild part deux

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        #4
        Maybe get some tiny washers and shim the needles to richen it up a bit.
        Roger

        Current rides
        1983 GS 850G
        2003 FJR 1300A
        Gone but not forgotten 1985 Rebel 250, 1991 XT225, 2004 KLR650, 1981 GS850G, 1982 GS1100GL, 2002 DL1000, 2005 KLR650, 2003 KLX400

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          #5
          The only time the "choke" richens the mixture is when the throttle is completely CLOSED. If that's the way you ride, it will work, but most of us enjoy opening the throttle a bit more than that.

          Depending on what modifications you have done to your bike, you can probably get away with simply turning the pilot screws out a bit. In their stock setting, they were very lean, to meet EPA regulations that were being imposed at the time. Turning the screws out 1/4 to 1/2 turn will do wonders for the way it runs.

          Now, if you have removed the stock airbox and/or installed "free-flowing" exhaust, you will need to re-jet eventually. Keep in mind that most of the need to re-jet is because you have removed the restriction of the stock airbox. That restriction is mainly at higher engine speeds and full throttle. Keep the revs down and keep the throttle at more-modest settings, you will be OK.
          If you're not living on the edge, you're taking up too much space.

          Comment


            #6
            thanks for the info. ill try fiddling with the pilot screws a bit
            1985 Suzuki GS450L

            Comment


              #7
              Originally posted by Who Dat? View Post
              The only time the "choke" richens the mixture is when the throttle is completely CLOSED. If that's the way you ride, it will work, but most of us enjoy opening the throttle a bit more than that.

              Depending on what modifications you have done to your bike, you can probably get away with simply turning the pilot screws out a bit. In their stock setting, they were very lean, to meet EPA regulations that were being imposed at the time. Turning the screws out 1/4 to 1/2 turn will do wonders for the way it runs.

              Now, if you have removed the stock airbox and/or installed "free-flowing" exhaust, you will need to re-jet eventually. Keep in mind that most of the need to re-jet is because you have removed the restriction of the stock airbox. That restriction is mainly at higher engine speeds and full throttle. Keep the revs down and keep the throttle at more-modest settings, you will be OK.
              Totally agree...Except the choke will effect the whole fuel range...The choke will foul plugs,dilute the oil,turn your pipes blue (if chrome) and smog up everything..Tune it...That's all.
              Last edited by gs11ezrydr; 07-30-2021, 02:34 AM.
              sigpic 82 gs1100ez 1168 Wiseco,Web .348 Cams,Falicon Sprockets,Star Racing Ported Head,1mm o/s Stainless Valves,APE Springs,Bronze Guides,etc.APE Billet Tensioner,36CV Carbs,Stage 3 Dynojet,Plenum w/K&N filter,Trued,Welded,Balanced,Crank w/Katana rods & Billet left end, FBG backcut trans, VHR HD Clutch basket,APE nut,VHR High volume oil pump gears,1150 Oil cooler,V&H Megaphone header w/Competition baffle,Dyna S,Coils,Wires,etc.Other misc.mods.

              Comment


                #8
                Originally posted by Who Dat? View Post
                The only time the "choke" richens the mixture is when the throttle is completely CLOSED.
                Sorry! but that is incorrect.
                On VM, BS and most (but not all) modern motorcycle carbs the "choke" ( Which is in fact usually an enrichening device and not an air restrictor ) supplies fuel direct from the float bowl via it's own independent circuit.
                Once opened it will supply additional fuel drawn by the lower atmospheric pressure in the venturi ahead of the slide and increase the fuel to air ratio of the mixture delivered to the combustion chamber no matter what throttle position .
                Because of this it can be used to help diagnose fuelling faults and determine over lean or rich mixtures by feathering the choke at the throttle opening where the issue occurs.
                Riding with the choke on or with a faulty plunger seal will cause rich running, power loss, lowered mpg and over a period of time accelerated bore and ring wear.
                Last edited by zed1015; 07-28-2021, 06:05 AM.
                Mikuni Viton Choke Plunger Seat Renewal.
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