I recently drained the fuel tank, and just backed the end of the machine over a slight drop off, and could easily get to the stoppers. I pulled down the metal pin in the middle with a pair of plyers and it came out ok. Just push the plug back in first, and then push the pin back up. It does not seem to leak. I want to drain my case next also. Does not appear to be gasket? Can one clean it out ok from the middle cover? My 1993 machine must be before all the safety switches, as it will start no matter where the bar, brake or seat is.