I was playing with my yoyo today. I’m practicing how to do basic binds. All along, my 10-ball C sized bearing is pretty quiet except for a faint relatively high pitched whirring of the balls inside. I played around with a trapeze mount and dropped the string on my NTH as if it were a bind. Consequently, I got a knot and fixed it without having to unscrew my yoyo. The subsequent throws I made suddenly had TONS of noise. It’s a night and day difference.
I just got this yoyo three days ago. The bearing supposedly comes off the box cleaned. I didn’t trust the cleaning because the yoyo was a bit responsive. So, I cleaned it and it delivered minimal difference. I clean bearings using denatured alcohol in a glass jar, spin it out for a bit, then use a hair dryer, then spin it again. I did not apply lube this time. It is a naked/deshielded unlubed 10-ball C sized bearing.
I know that lube will reduce the noise but I would be grateful if someone can tell me why this happened. I also do not mind the noise but I am scared that I did something bad/wrong for the bearing/yoyo that caused this. Is this what happens when debris or other substances get into the bearing’s innards?
EDIT: The bearing still plays the same as before except for the noise. No added vibration, no added/reduced responsiveness, no imbalance, no slowness.
EDIT2: I do not play my yoyo in dirt or any environment where things can slip through and get in the bearings. I play on tiled/vinyl/wooden/concrete floor. If necessary, I am using a Kitty String Slim.