notched

I notice when I sit on the bike straight up and turn the bars left to right, when I pass center, I can feel it like falling into a notch or index. Cant feel it while riding. I know on my bicycle, that would mean a bad head bearing, the race would be notched or scored. Is that the same...

I've been seriously thinking of stretching the 'Max since I'm keeping it. I want more of a "Chopper" look to the bike as that's what it is to me, a cruiser. I also thought about the notched swing arm for a 200 rear tire along with a stretch. Anybody have any pictures of a bike of this nature...