1. Cupped tires will do this, replace tires. see #2
2. Loosen the axle clamp bolts, compress the forks a couple of times, re-tighten axle clamp bolts. SOP when removing axle/wheel for any reason, but not always done.
3. Check steering head bearings for looseness.
4. Check rear wheel alignment.

 

You need a new front tire as it sounds like it is cupped.

 

I would say no.The only wobbles I ever get,happen when the front end comes off the road over a rise and I don't set it down quite right.3 small wobbles and its over.IMO I think these things are stupid stable.
5.Wheel bearings(high mileage)

Wheel bearings are the last link in the chain.A cupped tire is a visable thing.Im sure the guys at the shop would step out to look at it if need be.You can also jack the front end off the ground and turn the bars to check the headbearings,should be smooth no notchs.If you just buy a new tire(sweet fresh rubber)And have the shop do all the work,Tell them and they can check all that stuff.

 

check front tire sounds like you need a new one feel it see if its smooth or feels like the rockys

 

I've lost count of how many tires I've gome thru in 50k+ miles. I have experienced front end wobble when decelerating in the 35~45 mph range.

Now your wobble it could be any one or more of the above causes but rear tire wear (along with misalignedment of the rear wheel with the front wheel as mentioned) can cause a decel front end wobble. When the rear tire is "squared off" in conjunction with front tire wear (cupping in front or the tire actually wearing out-of-round), it can cause this problem.

I currently have a deceleration wobble when I completely let go of the bars in the 35~45 mph range, and will try to remember to report back if it disappears when I replace my squared-off rear tire before next season. My front tire is about half gone, and it is hard to tell if it is cupped or worn out-of-round at this point. Now with 50k+ miles, my stearing head bearings may be due for replacement. I intend to send my forks to Greg over the winter for him to work his magic over the mods I've already made (RT .90 spings, preload spacers and oil vicosity/volume tuning). So when the forks are off I'll check the head and wheel bearings and replace if required.