Scraping sound at front wheel of cbr250rr?

My '92 cbr250rr started making a noise at the front wheel on the first short trip after a long trip. The sound is a little like scraping or maybe something bumping the wheel guard and very intermittent. Doesn't occur when braking. Occurs when accelerating sometimes and often when coasting. Very very slight vibration felt through handlebars but usually not noticeable. Have inspected tyre, wheel guard and brakes and can't find anything but didn't do a very thorough inspection. Brakes appeared to still have padding on them. Any ideas what it may be or what I should look out for? Should I stop riding it? Any input greatly appreciated. I am very much not mechanically minded so laymen's terms are appreciated where it may be necessary. Thanks in advance.