Sounds like your headstem bearings are shot or in need of adjustment.
Put your bike on the centrestand, jack the front wheel off the ground and have somebody pull the front wheel back and forward while you put your finger on the top bearing joint. [under the top triple clamp]
If you can feel the movement nibbling on your fingertip this is where the slop is.
Adjustment is made by loosening the top nut and tightening the adjuster under the triple with a 'C' spanner.
A cheap, suitable 'C' spanner can be sourced at a bicycle shop.
Put your bike on the centrestand, jack the front wheel off the ground and have somebody pull the front wheel back and forward while you put your finger on the top bearing joint. [under the top triple clamp]
If you can feel the movement nibbling on your fingertip this is where the slop is.
Adjustment is made by loosening the top nut and tightening the adjuster under the triple with a 'C' spanner.
A cheap, suitable 'C' spanner can be sourced at a bicycle shop.