head stem torque specs?

I've got an 82 Maxim XJ650 with some serious front end wobble between 40
and 30 MPH. Two years ago the head stem bearings needed to be adjusted
and repacked. I did that myself, and I'm wondering if I don't need to
do it again. When I did it originally, I just tightened the bearings up
like you would front end/spindle bearings on a car. Should I have
torqued it to some specific amount or is the procedure identical to a
car's front end?

The steering seems to be smooth from right to left, so maybe the
vibration is caused by something else.

bc