If you apply the brake, you are creating friction on the wheel spinning, thus causing the bike to put more torque on the spinning wheel to keep it spinning against the resistance (brake). Then the torque sensitive front diff applies the same amount of torque to the other side causing it to spin too. Sounds to me like you have seen a torque sensitive diff work...
A torque sensitive diff applies the same amount of torque to both wheels. Unfortunately it applies whatever the least amount of torque needed to spin is on either wheel to both wheels. Therefore, if one tire is completely spinning with very little or no resistance very little torque is required. It equally distributes that amount of torque to the stuck wheel which isn't enough to spin it. Pressure on the brakes causes the spinning wheel to require more torque to rotate so the diff starts applying more torque to the other wheel. Eventually the other will start to spin too when your brake pressure resistance equals out to the resistance of the stuck wheel.
It's working exactly as its designed to. I agree, Honda needs a locker on the atvs like the big red has.
Last edited by a_tack; 12-13-2012 at 07:18 AM.