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GS1000 big or small port engine?

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    GS1000 big or small port engine?

    I have an engine. Don't know what year. Has points. No carbs. Engine# 152599 Unsure on what I have. Big or small port.
    Port diameter is 34mm where carbs bolt on.
    Can someone clarify?
    Thanks.

    #2
    Big port. From memory small port is around 29mm at the inlet face.

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      #3
      The later engines used BS34s (1000/1100) and the earlier VM26. The 34s will have intake ports approx. the same size as the venturi on the carb and same for the 26s. Suz started using 34s in 1980.

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