What RPM = MPH?

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  • Jerry
    XS & TRUE XJ GURU
    • Jun 2002
    • 3023
    • Elma, IA.
    #1

    What RPM = MPH?

    Changed the speedo on my XJ. Pulled the needle to remove faceplate from old unit to put on replacement, old faceplate was in beter shape. Think the speedo is reading to fast, parhaps I got the needle in the wrong place on its shaft. Anyway, it indicates 55 MPH at 3,500 RPM in 5th gear...been so long since I had a speedomoter I can't remember if this is accurate. 65 MPH is indicated at 3,900 - 4,000 RPM. Can someone tell me if these RPM - MPH numbers are pretty close?

    If anyone is going to try swapping speedos on the XJ, get one of those ratcheting, 90 degree Phillips screwdrivers. Will save a lot of frustration and time!
    Jerry Fields
    '82 XJ 'Sojourn'
    '06 Concours
    My Galleries Page.
    My Blog Page.
    "... life is just a honky-tonk show." Cherry Poppin' Daddy Strut
    Tags: None
    • nashville_bill
      XSive Maximus
      • Jul 2002
      • 605
      • Nashville, TN
      #2
      On my '81 special 3000 = 45 mph.
      Bill Murrin
      Nashville, TN
      1981 XS1100SH "Kick in the Ass"
      1981 XS650SH "Numb in the Ass"
      2005 DL1000 V-Strom "WOW"
      2005 FJR1300 Newest ride
      1993 ST1100 "For Sale $2,700" (Sold)
      2005 Ninja 250 For Sale $2,000 1100 miles

        Comment

        • Mike Hart
          XS-XJ Guru
          • Jul 2002
          • 1025
          • Seattle, Washington
          #3
          Pretty close, Jerry - my XJ has always shown 55mph=3600rpm
          Mike * Seattle * 82 F'n'XJ1100 *

            Comment

            • Dragonrider
              XS-XJ Guru
              • Jul 2002
              • 1219
              • Garland, Texas
              #4
              Get on the highway. Go exactly 60mph. Pass mile marker, time youself till next mile marker. 60mph=60 seconds for 1 mile.

              More seconds, you are going too slow, less seconds you are going too fast . . .
              CUAgain,
              Daniel Meyer
              Author. Adventurer. Electrician.
              Find out why...It's About the Ride.

                Comment

                • crunchbird
                  Truly XSive
                  • Jul 2002
                  • 118
                  • Tigard OR
                  #5
                  The speedo reads off the front wheel, regardless of gear. On the Specials, 3rd gear = speed i.e. 4000 rpm = 40 mph, 5500 rpm = 55 mph. Also, 5krpm is about 65 mph in 4th, 75 mph in 5th. I have significant hearing loss, yes.
                  David Browne
                  XS11SG Crunchbird
                  XS500E

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