I have a sportster and it doesn't have a drain plug. It has a drain hose that is located under the engine and is connected to the rear pipe mount on a stud with a small hose clamp. Loosen the hose clamp and just pull the hose off the stud and the oil will drain. Don't forget when replacing the oil to put about 4 oz into the filter before putting it on and make sure the oil starts to come out of the drain hose before reconnecting it to the stud or the oil will get vacumed similar to vapor lock. Hope this helps.
From the right side of the bike, get down and look underneath the area where the gearbox is located, you will see a drain plug in the middle of the gearbox casing (obviously for the gearbox) and nearer to the outside of the bike there is a same size drain plug in a small down tube which is open at the bottom and is connected to the oil tank.
Bottom of the oil pan.
on the bottom of the oil pan
The original engine oil drain plug wrench size should be 15mm.
all you do is undo the nut on the bottom of the sump and drain the oil
Have to drop the transmission oil pan
counter-clockwise
3 1/2 quarts
It is underneath the car at the rear of the oil pan next to the drain plug.
Bottom of the engine next to the drain plug
Can't Speak for all Twin Cams but on my 04 Heritage is between the shocks underneath the frame..
Alex Harley was born on 1936-04-20.