1977 GS550 Tachometer Drive Ratio?

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  • StickerDan
    • Jan 2026

    #1

    1977 GS550 Tachometer Drive Ratio?

    Has anyone used an aftermarket mini-tach?? My 1977 GS550 is now a hard-tail bobber, and I would like to NOT eliminate the tach drive wire, and put a more compact tachometer instead of the old gauge cluster. Has anyone used or gotten a tach? Or does anyone know what the tach drive ratio is?? I found somewhere that maybe 5:1 but I'm not sure how reliable that source would be and I need to get a tach within a day or so. Any help would be appreciated!!
  • OLDENUFF

    #2
    With the front wheel raised, count how many revolutions the cable makes when rotating the wheel one full turn. You will have your ratio.

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    • Souske

      #3
      Pull the plugs, and count how many times the cable spins while cranking it over by hand?

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