Today I took a long ride up into the hills with some friends on my 1973 750 Tiger… Probably about 100 miles of riding. I return home and notice the oil pressure light is on when I pull in the garage. Rev the bike a little so see if it’s an issue of thin oil… light stays on. Look down at my return line; there’s oil moving there. Long story short: I pull the timing cover off and the crank end seal was ripped. So I was riding with very little pressure. I fixed the seal and the engine built up good pressure and held it for 4 or 5 seconds after killing the warmed engine. No weird noises or other abnormal behavior. How much sleep should I lose over this?