What I have done... don't always do it...
put a tie down between the swing arm
& rear rack..pull the rear down till the
front sprocket/swing arm pivot / rear axle
are in line.. adjust the chain at that point
so theres only a little bit of play...
when you let the tie down off... you can
measure the play in the chain....

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...