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GS1000 Main / Pilot Jet Size

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    GS1000 Main / Pilot Jet Size

    I have a 1978 GS1000 (I believe its a 1000E)
    I was told that the stock jets should be 95 main/15 pilot. I found 108.5 main/15 pilot in mine when i tore them apart.

    Since then i've added
    -k&N pods air filters
    -bored the engine 2.5mm over (100cc)
    -added Vance and Hines 4 to 1 exhaust

    The papers that came with the Vance and Hines exhaust said to use 117.5-120 main jets. I'm guessing i need something more around 125 main/17 pilot, but i really have no idea. Can anyone give me some ideas on where to start? Has anyone made these mods before?

    Thanks.

    #2
    Don't you wish there was just a program out there where you plug in your information and it tells you what to use? I'm going to be moding my bike very soon (v&h has shipped) and will go through the same process.

    Hope you find what you want. Sorry I was no help.

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      #3
      I would buy the Dynojet kit for it. Done.

      You may have to bump your pilots, but maybe not.
      Last edited by renobruce; 08-14-2008, 06:44 PM.
      85 GS1150E May '06 BOM
      79 GS1000S Wes Cooley Beast





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        #4
        You're on the right track. You will also need to raise the needle.
        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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