81 gs750e - lots of choke needed until warm

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  • tc80211
    #1

    81 gs750e - lots of choke needed until warm

    Hey guys

    Been dealing with this for a while and wondering if there is something else occurring. Once my engine is warmed up, idles great and runs like a champ.

    But. A cold start I have to choke and then ease of choke and just sit with throttle for a couple off minutes until warm.

    I dd recently rebuild and jet, but this problem persists. Maybe not a problem at all? Unsure. Any thoughts would be great.

    Mixture screws are approx 2 3/4 turns out. Stock needle because dynojets would run no matter my adjustments.
    Tags: None
    • tc80211
      #2
      *wouldnt run

        Comment

        • eil
          Forum Sage
          • Dec 2012
          • 3062
          • SE Michigan
          #3
          Cold engines require more fuel to run, so it's totally normal to need to have the choke on for the first few minutes. The engine will idle high with the choke on, that's normal as well.

          You should be able to ride away with the choke partially on, if all is well with the engine and its carburetion.

          And in case you're trying to mentally picture what's going on, it's helpful to know that these carburetors don't use the traditional "choke" mechanism. It's more like an enrichener that just dumps a bunch of fuel into the intake when the choke lever is pulled.
          Charles
          --
          1979 Suzuki GS850G

          Read BassCliff's GSR Greeting and Mega-Welcome!

            Comment

            • subid
              #4
              Maybe this will help

              http://members.dslextreme.com/users/storagecliff1/images/Adjusting_Idle_Mixture_on_CV_Carbs.pdf

                Comment

                • tom203
                  Forum Guru
                  Past Site Supporter
                  • Aug 2010
                  • 8925
                  • Norway,Maine
                  #5
                  Originally posted by tc80211
                  Hey guys

                  Been dealing with this for a while and wondering ....

                  I dd recently rebuild and jet, but this problem persists. Maybe not a problem at all? Unsure. Any thoughts would be great.

                  Mixture screws are approx 2 3/4 turns out. Stock needle because dynojets would run no matter my adjustments.
                  Tell us more about your "rebuild and jet". did you read and follow the carb cleaning tutorial? My bike is pretty coldblooded, but I start and then leave "choke" on about 1/4 and take off after maybe 30 seconds; choke fully off in two minutes
                  1981 gs650L

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

                    Comment

                    • tc80211
                      #6
                      Thanks guys!

                      I did a full carb breakdown and pinesol dip for 24hrs. It was labor intensive to ensure I cleaned the carbs as needed, but the end result was amazing. Look almost new. Using the stage 3 dynojet kit, 4 carb rebuild kits and oem size metric washer kit I reassembled the carbs following BikeCliffs instructions http://www.mtsac.edu/~cliff/storage/...d_Tutorial.pdf

                      I am using stock exhaust and pod filters so went for the 124 jet instead of the 130...

                      I initially used the dynojet needles and could not find a happy place with air/fuel misture screw to get the bike to behave... Switched back to stock needle and arrived at 2 3/4 turns out on mixture screw... however, this was my first time playing with carbs, ever... so I have been on here and every resource possible to try and learn about what is happening... Now when the bike is warmed up it runs like a champ, power is much improved and throttle resonse is great. Solid up to and over 100mph. The only remaining peice is cold starts and I believe this newest resource could be the key to getting my mixture as dialed in as possible... Also, I need to sync. I dont have any hesitation on acceleration and once the bike is warm and idling, it stays put, no bounce... but still a vaccuum sync would ensure all is well in that department.

                        Comment

                        • Guest
                          #7
                          Take the idle mixture screws out a quarter turn at a time until you find a happy spot.
                          The DJ needle would not work? Weird! Makes me think there is something wrong or you got a fake DJ kit. (They are out there)

                            Comment

                            • tc80211
                              #8
                              Bought direct from dynojet. Thats not to say I couldnt have used different needle positions... sure, but the instructions it came with didnt indicate what other positions to try based on lean/richness... I'll give the mixture screw more attention and try to get it further dialed in. Thanks all!

                                Comment

                                • Guest
                                  #9
                                  Originally posted by tc80211
                                  Hey guys

                                  Been dealing with this for a while and wondering if there is something else occurring. Once my engine is warmed up, idles great and runs like a champ.

                                  But. A cold start I have to choke and then ease of choke and just sit with throttle for a couple off minutes until warm.

                                  I dd recently rebuild and jet, but this problem persists. Maybe not a problem at all? Unsure. Any thoughts would be great.

                                  Mixture screws are approx 2 3/4 turns out. Stock needle because dynojets would run no matter my adjustments.
                                  Sound normal to me, my 750 has been cold natured from day one.

                                    Comment

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