650G RPM / Speed question...

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  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #1

    650G RPM / Speed question...

    For anyone with a 650G with more or less standard tire sizes, what is the speed in fifth gear at say 4000 or maybe 5000 RPM?

    Thank!
    Last edited by tkent02; 12-02-2013, 06:53 PM.
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    Life is too short to ride an L.
  • Griffin
    Forum LongTimer
    Past Site Supporter
    • Sep 2003
    • 14205
    • Danville, IN

    #2
    According to the June 1981 Motorcyclist test, at 60 mph in top gear, the engine was spinning at 4,634rpm.
    GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
    KZ550A KZ700A GPZ750
    CB400T CB900F
    XJ750R

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    • tkent02
      Forum LongTimer
      Past Site Supporter
      • Jan 2006
      • 35571
      • Near South Park

      #3
      Huh, I thought it was higher. Thanks.
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      Life is too short to ride an L.

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      • Steve
        GS Whisperer
        • Jun 2005
        • 35925
        • southwest oHIo

        #4
        Originally posted by Griffin
        According to the June 1981 Motorcyclist test, at 60 mph in top gear, the engine was spinning at 4,634rpm.
        That would be about 65 mph at 5000 rpm.

        My son's 650L is put away right now, or I would take it out for a spin, but that's about the speed I remember.

        Yes, you asked about the G, but in the 850/1000/1100 gear comparison, there was virtually no difference between the G with a 17" wheel and a GL with a 16" wheel (5021 vs 5016 rpm @ 70 mph), and I know the 650 spins a bit higher than the 850.

        .
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        • Klaoutdoors

          #5
          My 81 650g runs around 66 to 68 at 5000, but there is still more left to it after that

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          • tkent02
            Forum LongTimer
            Past Site Supporter
            • Jan 2006
            • 35571
            • Near South Park

            #6
            Originally posted by Klaoutdoors
            My 81 650g runs around 66 to 68 at 5000, but there is still more left to it after that
            It's the more after that I'm interested in. Planning sprocket ratios for the 550/675, it now goes 76mph at 5,000 in 6th. If I drop that to what the 650 did, about 66 - 68 in 6th gear at 5,000, it should top out at about 120 something and be very quick in the lower gears. Thank for your help.
            http://img.photobucket.com/albums/v5...tatesMap-1.jpg

            Life is too short to ride an L.

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            • Griffin
              Forum LongTimer
              Past Site Supporter
              • Sep 2003
              • 14205
              • Danville, IN

              #7
              Originally posted by tkent02
              It's the more after that I'm interested in. Planning sprocket ratios for the 550/675, it now goes 76mph at 5,000 in 6th. If I drop that to what the 650 did, about 66 - 68 in 6th gear at 5,000, it should top out at about 120 something and be very quick in the lower gears. Thank for your help.
              I changed the ratios on my 650E so that at 60 mph it is spinning at 4,200 rpm in 5th gear, which is fine, because that's right where the power surge begins. It will no longer pull redline in 5th, but tops out about 500 rpm below redline (9500 rpm), going 117 mph as measured by GPS.
              GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
              KZ550A KZ700A GPZ750
              CB400T CB900F
              XJ750R

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              • duaneage
                Forum Guru
                GSResource Superstar
                • Apr 2004
                • 6149
                • Wilmington Delaware

                #8
                I found the engine rpm would vary by a few hundred rpm by changing tire size. It's the only practical way to re gear it.
                1981 GS650G , all the bike you need
                1980 GS1000G Power corrupts, and absolute power corrupts absolutely

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                • tkent02
                  Forum LongTimer
                  Past Site Supporter
                  • Jan 2006
                  • 35571
                  • Near South Park

                  #9
                  Yeah, that's a shafty thing.
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

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