Both the Engine and Transmission plugs are the same and they can be used from approximately 1980's to present day 2012 models, using the popular SS 1/2"X20X1/2" thread size. 1999 low riders and all Sportsters don't have a drain plug because they have a tube to drain the oil.
Directly at the lowest spot on the primary cover.
where is the oil drain on a 2002 harley softtail
It is under the bike nearly in the center of the drain pan, forward of the shocks. It is an Allen head plug. It's the easiest one to find because it's in the drain pan.
oil tank
buy a pump and drain tank only, do not run dry if it's fuel injection
The 2003 Harley-Davidson Heritage Softtail transmission drain plug is on the bottom of the transmission. The drain plug is flush with the bottom of the transmission. You can remove it with a half inch ratchet.
It is a hex bolt with an Allen head recess in the middle. It's located on the RH side of the bike, behind the shocks and in line with one of the frame supports. It's is right next to the frame. Look directly below the oil tank reservoir.
On a 1993 Harley Davidson Low Rider custom, the transmission drain plug is underneath the transmission. The filler plug is on the side of the transmission case.
on the right side botom near front of rear swingarm (follow the tube down)
The drain plug is under the engine, near the kick stand.
Bottom of the engine on the oil pan.
what model first of all. all HD oil tanks have a drain plug. It is not on the engine as previously discussed elsewhwere here because Harley has a dry sump engine.The oil is held in an oil tank and pumped into the engine then out and back into the oil tank. The drain plug, on the tank will be at the lowest point and generally accessable