It is sometimes simpler to drain the oil from the fill tube and this is Toro's recommended method, for example.
On a vertical shaft B&S engine, the drain plug is a pipe plug with either a 3/8 square recessed male x 18 NPTF (National Pipe Thread) or an exposed square plug. It is usually at the 4 o'clock position within 2" of the output shaft with the spark plug location being called 12 o'clock. -- JP
underneath where the blade is you will see a plug. that's it
there should be a square headed plug at the base of the motor
The way to drain gasoline from a Briggs and Stratton lawn mower is to take the oil cap off and drain the oil. From there, run a rubber hose into the drain and siphon the rest of the oil and gas out.
It is at the rear, bottom of the engine and it usually has a square bolt.
It is either on the side of the engine at the very bottom next to the deck, or it is under the mower on the engine block.
drain the oil and put in fresh
Far easier to drain old oil through filler tube, remember to always keep cylinder head [spark plug end] pointing up when tipping mower.
i just take the cap off and tip them to the side into a drain pan, most of them have a plug on the bottom, but easier through the fill tube
There is a large allen head pipe threaded set screw (oil Plug) located in a hole under the engine . Remove to drain oil. Becarefull when replacing plug not to over tighten it will crack the case if you turn in to tight.
There is usually a square 1/2 inch plug under the crank-case to drain the oil. The you replace it with the correct amount.
The drain bolt in under at the rear of the engine.
The drain plug for the engine is on the bottom of the pan There is no drain plug on the transaxle.