Harly davidson heritage softtail
many things can cause this ,if you change your seating postion ( lean forward / move backwards does it go away?....
front forks loose at triple tree,
new front / rear tire more aggressive tread than before,
front wheel loose,
worn head bearings,
bent rim,
loose spokes if any,
wrong tire pressures,
loose handle bars
,some new addition to change the handling of the bike , rear seat rest etc,
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