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83 Suzuki GS750ES speedo reads low

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    #1

    83 Suzuki GS750ES speedo reads low

    Hi picked this bike up last year and just did normal maintenance
    It seems the speedo reads low
    70mph at 7k rpm in 5th
    Any ideas what to check?
    Thanks
    Tags: None
    #2
    Originally posted by charlie27 View Post
    Hi picked this bike up last year and just did normal maintenance
    It seems the speedo reads low
    70mph at 7k rpm in 5th
    Any ideas what to check?
    Thanks
    I don't know what to do to fix it, but have you verified that your gauge is reading low. I found out a few weeks ago why the cops haven't been pulling me over. My gauge on my '82 1100E reads 40 when a "your speed" road sign said I was only going 32. I know the sign was correct, because I went by it a week ago in our '16 Altima an it was spot on with the cars speedo.
    :cool:GSRick
    No God, no peace. Know God, know peace.

    Eric Bang RIP 9/5/2018
    Have some bikes ready for us when we meet up.

    Comment

      #3
      70 at 7k seems crazy. Are the sprockets stock sized?
      sigpic
      When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

      Glen
      -85 1150 es - Plus size supermodel.
      -Rusty old scooter.
      Other things I like to photograph.....instagram.com/gs_junkie
      https://www.instagram.com/glen_brenner/
      https://www.flickr.com/photos/152267...7713345317771/

      Comment

        #4
        Yes stick gearing and going faster than indicated which is quite the opposite of overly optimistic speedo

        Comment

          #5
          On my 83 750e the bike runs at 55 according to speedo and radar sign, while tach sits at 4K exactly.
          100/90/16 front tire up one size from stock and stock gearing
          1984 GS1100GK newest addition to the heard
          80 GS 1000gt- most favorite ride love this bike
          1978 GS1000E- Known as "RoadKill" , Finished :D
          83 gs750ed- first new purchase
          85 EX500- vintage track weapon
          1958Ducati 98 Tourismo
          “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
          If it isn't going to make it faster or safer it isn't worth doing

          Comment

            #6
            Best: Get a gps and a straight long road. OR use the odometer and a watch. The odometer is far more reliable than the speedo, being gear driven. PLUS the odometer can be tested by riding a distance from a map.
            ADD: the tires' diameter can slightly affect accuracy of all except the gps.

            You can't trust the tach to calibrate the speedo.
            Last edited by Gorminrider; 10-12-2017, 02:08 PM.

            Comment

              #7
              Originally posted by Gorminrider View Post
              Best: Get a gps and a straight long road. OR use the odometer and a watch. The odometer is far more reliable than the speedo, being gear driven. PLUS the odometer can be tested by riding a distance from a map.
              ADD: the tires' diameter can slightly affect accuracy of all except the gps.

              You can't trust the tach to calibrate the speedo.
              Lucky if the tach still works....
              Dee Durant '83 750es (Overly molested...) '88 gl1500 (Yep, a wing...)

              Comment

                #8
                GPS works great. All my bikes other than my Gold Wing read 10% fast. Not uncommon. Verified by GPS, "you are driving" signs and no tickets...
                Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple:twistedevil:, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
                Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
                Work in progress: 78 GS1000, unknown year GS1100ES

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