GS1000 Main / Pilot Jet Size

[CobraHicks]

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.

[Skyboy8950]

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.

[renobruce]

I would buy the Dynojet kit for it. Done.

You may have to bump your pilots, but maybe not.

[chef1366]

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