often times the speedo does what you are talking about simply because it's sticking, if you can find some spray graphite, you should be able to fix it by pulling the speedometers apart just enough to get the spray can straw in there, spray around a bit, and close it up, they are of course designed to keep it sealed so people can role it back to reduce the number of logged miles, but spray graphite is amazing stuff, it's mixed with alcohol so it dries to a nice slippery film as you don't want anything that will attract dust.
I had my scooter out Thursday for a while, filled it up with .41 gallons and put a wire basket on the rear rack, looks much better then a milk crate and holds stuff nearly as well.
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