By removing the plug at the bottom of the oil pan and letting the oil out.
there is no crank case drain plug on your engine, only a plugged drain line coming from your oil tank.
The Crank Case is dirty. Use a good Crank Case cleaner to solve problem like Motor Medic Motor Flush. Warm engine 5 minutes and let clean out for 5 to 7 minutes. Then drain and use fresh oil.
"Crank" meaning the starter doesn't crank the engine over to start it, changing the engine oil should have nothing to do with it not starting. If the battery was weak and something was left on, it may have run the battery down. Also check the engine oil level to be sure they put new oil back in or possibly left the drain plug loose and the oil drained out. If the engine was run with no oil in it, it could have seized the engine and it wouldn't crank over, in which case the engine is ruined.
There is no drain on the engine you have to drain the oil tank and then remove a hose turn the bike over to get the oil out of the crank case (dont let it run too long). Change the oil filter and then seal it up and fill with 20/50 . Check the tank again after running it a few minutes. Enjoy your ride.
TAKE OFF HOSE CLAMP UNDER CRANK CASE AND DRAIN OIL
The drain plug under the crankcase is for removing the old oil during an oil change. Always change the oil filter at the same time.
That depends on your moped. Most mopeds madein the 80's are two stroke engines. Which do not use oil in the crank case. the oil is mixed in with the fuel.
There are two oil drain plugs. One located on the engine case the other on the oil sump. Both are large drain plugs and will dump oil at a very fast rate.
PW 80 is a 2 stroke. It does not have oil in the crank case. I think you mean transmission oil. I use 10w40 engine oil in mine and it works great.
You drain the engine oil from the drain plug on the bottom of the oil pan.You drain the engine oil from the drain plug on the bottom of the oil pan.
The oil drain plug is at the bottom of the oil tank (for engine). Bottom rear of primary case for primary & transmission.
The crank case say 2.4 liters.