The advance curve on your bike is contolled by a black box. It is triggered by a rotor that attaches to the end of the crank on the right side under that little cover. An advancer replaces that rotor with one that has the little tab or tabs rotated a few degrees so that the whole advance curve is moved up. It will usually improve the midrange a little but will probably require you to use higher octane fuel if you are using regular unlead now. It is cheap, simple and easily reversible. Factory Pro makes them in adjustable and fixed models.
One of the bike mags (SportRider?) installed one on a pre-03 6R in a shootout betwene the new 03 and the previous gen 6R. They did a bunch of other stuff too, but they seemed to have good results with it. I think the guy who owned the 6R actually logged on here a few times, he's from California I think???
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