Need opinions on the next step to get my GS850 on the road

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  • fishmeok
    #1

    Need opinions on the next step to get my GS850 on the road

    OK, here's where I'm at with my '81 GS850G.
    Replaced the rubber in the carbs, cleaned, reset the floats, reinstalled.
    Question- does anyone carry that little rubber pilot jet plug? Every place I've looked has it marked as discontinued.

    I also Re-set the valve clearances

    I have been able to get the bike running and idling, but not very well (the airbox is still off so I'm not too concerned about the idle yet) but it will bog down above 1/8 throttle then catch slowly back up and go to higher revs- sometimes it just stays bogged down (bike free-revving with no load). How much of this can be caused by the airbox being off? Should I pull the carbs again and double check float height?

    Thanks
    Mark
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    • salty_monk
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Oct 2006
      • 14001
      • London, UK to Redondo Beach, California
      #2
      The airbox being off will make a huge difference from what I have seen & heard.

      I can't comment on float height but I have heard that they are not too fussy if you are somewhere close to spec. It might be worth trying it with the airbox on as it's not a huge job.

      Dan
      1980 GS1000G - Sold
      1978 GS1000E - Finished!
      1980 GS550E - Fixed & given to a friend
      1983 GS750ES Special - Sold
      2009 KLR 650 - Sold - gone to TX!
      1982 GS1100G - Rebuilt and finished. - Sold
      2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

      www.parasiticsanalytics.com

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        Comment

        • fishmeok
          #3
          Thanks- I'm waiting for new airbox rubber hoses- the ones originally on the bike are trashed.
          Cheers
          Mark

            Comment

            • salty_monk
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Oct 2006
              • 14001
              • London, UK to Redondo Beach, California
              #4
              Take it you've seen this http://www.cycleorings.com/

              Dan
              1980 GS1000G - Sold
              1978 GS1000E - Finished!
              1980 GS550E - Fixed & given to a friend
              1983 GS750ES Special - Sold
              2009 KLR 650 - Sold - gone to TX!
              1982 GS1100G - Rebuilt and finished. - Sold
              2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

              www.parasiticsanalytics.com

              TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

                Comment

                • bwringer
                  Forum LongTimer
                  Bard Award Winner
                  GSResource Superstar
                  Past Site Supporter
                  Super Site Supporter
                  • Oct 2003
                  • 17066
                  • Indianapolis
                  #5
                  No airbox will goof up the whole range. It definitely IS crucial. I'm surprised you could get the bike to start without an airbox.

                  In my experience, float height is also very important. Assuming the rest of the intake system is healthy and well-sealed, you can easily tell the difference between 0.5mm adjustments of float height. This primarily affects the midrange and low midrange.

                  And yes, the rubber passage plugs are important as well. CRC2 and Z1 Enterprises might be able to help you out with these, if you haven't checked already. They also pop up on eBay commonly.
                  1983 GS850G, Cosmos Blue.
                  2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
                  2015 Yamaha FJ-09, Magma Red Power Corrupts...
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                  Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

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                    Comment

                    • fishmeok
                      #6
                      I already bought the o-ring kit- awesome deal. I think I need to get the idle passage plugs as well though- decided to try the old ones but I don't think it's going to work. . .
                      So new airbox boots, I have already sealed the airbox, replace the idle passage plugs, re-check the float height, and try again-

                      Thanks guys
                      Cheers
                      Mark

                        Comment

                        • Schweisshund
                          #7
                          The best place to go for discontinued parts for your bike is e-bay. or even the parts section of this forum. Look for a complete carburetor for your bike so you have a spare if anything else needs to be replaced. You will also need a great deal of patience. These are old fussy ladies we are working on.

                            Comment

                            • Guest
                              #8
                              Click here for the pilot jet rubber plugs.

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