1976 R90/6 Went for a ride today and when I returned I noticed the rubber plug was missing from the inspection hole next to my dipstick. I am positive it was there before the ride because I have been looking at it threatening to check the timing on the bike. Anyway I wonder if this plug blowing out could be an indication of a problem of some sort? Crank case ventilation maybe? Maybe its the airhead gods telling me to stop procrastinating and check the timing already?