Returns or specifies the maximum angular motion about the y-axis.
The value returned by this property depends on the current value of the yMotion property. If it is ConfigurableJointMotion.Locked, then it will always return 0. If it is ConfigurableJointMotion.Free, then it will always return the upper limit of yRange. If it is ConfigurableJointMotion.Limited, then it will be clamped between the upper limit of yRange and the current value of yMin.
Additional resources: yMin, yMotion, yRange.