It's not the plug that would worry me. When you patch and plug an automotive tire there are still 3 non pluged tires on the ground. Add to this that an automotive tire does not go thru the stresses that you put on a motorcycle tire. That hole in the motorcycle tire has compromised the inner wraps and the tread. If you watch videos of motorcycle tires under load and see how the tire treads open and close with the stress. My worry is that the stress around the hole will cause the tread or inner blys to shift or seperate and cause the tire to go flat very rapidly.