I can only speak about aircoolers, but I think the front end is pretty much the same - YOU'LL NEED TO DOUBLE CHECK.
To check what is at fault, the king pin will be at fault if the wobble is most obvious when grabbing the wheel top and bottom and trying to wobble it up and down. The if its anything to do with the bearing, the wheel will wobble which ever way you try it. Also have a look under while wobbling to be sure its not the steering or suspension. Any wobble will be more noticable with the wheel on due to the extra weight and leverage.
The hub nut should be tightened to 5lb. This is then checked with a feeler gauge and there should be a gap (endfloat) between the hub and the nut of between 0.025 and 0.1mm. The nut is staked (locked using a punch). It is as likely to be worn bearings - you can normally hear a rumble when you spin the wheel if they are worn.
If the endfloat is too wide, then its as well to buy a new nut as the staking may be weak if its very near to a previous staking. The right hand nut has a left hand thread.
If its the bearings, its straightforward to replace once you get the old ones out.
Remember this is aircooler details so check in your manual for BIS to be sure.
Also have that clunk on my 500 - I am suspecting tired gearbox mounts and the box is slightly too low (raising the exhaust). I'll let you know if that fixes the problem for me - though the BIS box is mounted differently - don't know if you can adjust the height.