Check your wheel bearings and head bearings, youll need help for the head bearings as you need to have the front off the ground to see if there is any play, back n forth and when its turned left and right, if its notchy there gone may need a tighten up!!, like wise if you have sideways play in you front wheel you may need them replaced.

IS the tyre fairly new? as the tyre wears it may cause a wooble or strange handeling, check to see if its near uniform tread over the tyre. my cbr is needing a new tyre and its has a wooble on at low speed you can see the tread is wearing badly (next weeks job!!!)

And obviously check all nuts n bolts are tight, !

thats a start, if you cant find anything wrong might be worth taking it in if your still worried to have it checked over.