Are we confusing torque with gyroscopic forces in this case? I've never noticed any difference in this sort of situation from revving the engine, but I HAVE noticed a difference with a little bit of clutch applied, to keep the power to the tire, which only adds confusion to the discussion! A NECESSARY "byproduct" of the physics involved. But, you CAN lean a bike without turning it. Maybe not by a huge amount, but you can. Put your hands on the tank and try to turn with JUST leaning. You will turn, but it won't be nearly as much as expected. Dis claimer: I'm not advocating riding with your hands off the controls, find a closed course to do so. Doing so on the street or highway is not a good idea, even if most of us have taken our hands off the controls just to prove to ourselves that we can.