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ยท Loves All Motorcycles
1,164 Posts
Welcome to the forum! Normally we would ding you for the lack of introduction but you do have a bike and a location so I guess I'll let it slide.

To answer your question, according to the genuine shop manual (shamelessly copied from a thegsresources thread):

The GS1000C/E/L & the S all have Mikuni VM26SS carbs.
The GS1000GT/GX/GLX had Mikuni BS34SS carbs.
The '79 'SN' series GS1000 ran 28mm Mikuni carbs.

There were bigger carb options like a 30mm, but those were largely for models outside North America.
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