The welding the bars experiment you are talking about is done in a motorcycle school I once took with Kieth Code (California Superbike School), in order to prov

The welding the bars experiment you are talking about is done in a motorcycle school I once took with Kieth Code (California Superbike School), in order to prove to riders that countersteering is real. I held an American Pro Superbike racing license in my 20s and countersteering is the only way I ever steered. Here is an experiment - go into a flat and wide open space like a parking lot, ride straight, and then turn to the right hard while keeping straight up and down. Hold the pressure to the right and I promise you will turn left or will initiate a turn to the left. The harder you turn the bars right the quicker the bike will fall left and begin arcing left. In chicanes on a circuit track you can flip the bike over from one side to the other extremely quickly doing this. I've done this on everything from mountain bike to superbike, the latter being a more pronounced effect. The only time I don't countersteer is when doing a 180-ish degree turn on a dirtbike, like what is common on an SX course. Also, when doing an extremely slow turn on a sport motorcycle, like what's common in USA motorcycle safety courses. But when moving at speed I always countersteer. Knowing this phenomenon and using it may save your life.