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81 GS1000 jetting for 4 into 1

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    81 GS1000 jetting for 4 into 1

    I am installing a V&H 4 into 1 header on an 81 GS1000 and need to know what to re-jet carbs to...header was bought used and came with no jetting instructions..."falls flat on its face" around 5500 to 6000 rpms....any help is much appreciated...thanks

    #2
    Do you have the stock intake system? Stock engine?
    Are you somewhere near sea level?
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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      #3
      I'd put in a 122.5 main jet
      Shim the jet needle
      Take out the idle mixture screws a bit
      1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
      1985 GS1150ES stock with 85 Red E bodywork.

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        #4
        Intake is stock and motor is stock....located in Michigan

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          #5
          Go with what Chef says. Better yet go one size richer on the main jet, he likes to burn holes in pistons.
          http://img.photobucket.com/albums/v5...tatesMap-1.jpg

          Life is too short to ride an L.

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            #6
            bforster199, I agree with Chef and would also suggest possibly bumping your pilots to 42.5. Maybe pick up the 120, 122.5, and 42.5 pilots before starting your project so you have them on hand. The Mikuni jets are only about $ 3 each last I checked. I am currently running a stock airbox with a K&N filter, 120 mains, shimmed needles, and the 42.5 pilots on my 1000.

            All bikes are not the same even within motors but that should get you close enough to fine tune from there. If you have not done it yet I would also suggest adjusting your valves, replacing intake boots and o-rings, replacing the airbox to carb boots, replacing exhaust gaskets, and sealing your airbox before even starting on your jetting. Unfortunately there are no shortcuts to proper jetting so if you have any intake or exhaust leaks you will not get accurate plug reads and it will be very difficult to get it to run right.
            82 GS850L - The Original http://s224.photobucket.com/albums/d...ePics067-1.jpg
            81 GS1000L - Brown County Hooligan http://s224.photobucket.com/albums/d...ivePics071.jpg
            83 GS1100L - Super Slab Machine http://s224.photobucket.com/albums/d...t=DCP_1887.jpg
            06 KLR650 - "The Clown Bike" :eek: http://s224.photobucket.com/albums/d...nt=SERally.jpg
            AKA "Mr Awesome" ;)

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              #7
              thanks alot guys....your input has helped tremendously....i can move forward with the re-jetting project now...thanks again!!

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