The 1982 850 does not have a mechanical advance - ignition advance is built into the ignitor. If your bike has a Dyna S installed it needs to also have a mechanical advance transplanted from an earlier 850/1000/1100.
Once you have the mechanical advance installed, you should be able to use your fingers and grab the black magnetic ring on the rotor and twist it with your fingers - is should rotate for about 20 degrees or so under spring load. It's common for the Dyna S magnetic ring to bind when the screw is locked down due to inadequate clearance under the washer. Play around with the washer thickness until you have a few thousands clearance when the screw is tightened down.
Hope this helps.
Once you have the mechanical advance installed, you should be able to use your fingers and grab the black magnetic ring on the rotor and twist it with your fingers - is should rotate for about 20 degrees or so under spring load. It's common for the Dyna S magnetic ring to bind when the screw is locked down due to inadequate clearance under the washer. Play around with the washer thickness until you have a few thousands clearance when the screw is tightened down.
Hope this helps.
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