Today I got my bike back from a fork seal change. I also had the head bearing changed at the same time. The original bearings were ok but just had a little knock when breaking so I figured why not get them changed. They've been replaced with all balls and tbh, the knock is still there. The shop tightened the headstem further and the knock is still there. Is this a normal thing for the zx12?I have used All-Balls bearings twice before, and for some reason they never quite fixed the headstem knock/slack. It would work for a while then get slack again. I went back to oem which works fine for me. Now I'm not saying they are no good, just my experience, maybe I did something wrong with installation, but the oem ones are okay. I'm sure others will have good reports about All-Balls.