[5th_bike]

The oil drain plug is a big bolt in the middle of a round plate that is secured with 3 smaller bolts. It is called "cap, oil strainer" and provides access to the oil strainer.

Recently, someone had overtightened the oil drain plug and ruined the threads, so he had to get a new cap, not a whole new right half of engine. That was a relief !

You can also 'look' at the underside of the bike with a small mirror.

And, parts stores always have 'blow ups' of the parts of your motorcycle. You will find a drawing of the oil strainer cap and the drain plug on a blow up called "Oil Pump".
Example: go to mrcycles.com click "Suzuki Motorcycle Parts" click "2005 Suzuki Motorcycle Parts" click "2005 GZ250" select "Oil Pump" from the drop down menu, and there it is (scroll down to the bottom of the drawing).