There is a rubber line that attaches to the bottom of the oil bag. Pull that line and the oil will drain
The drain plug is under the engine, near the kick stand.
The 82 had the plug on the bottom of the oil tank. No plug on cases.
Check out the pictures at the following website. The drain plug is toward the rear of the bike, in front of the rear tire. http://www.harleydavidsonmaintenance.com/sportster-oil-change.html
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Drain plug for what?
There is no transmission drain plug. Your transmission uses the same oil from the primary. Draining your primary drains your transmission.
the trans and primary fluid on a sportster are the same (1 qt sport trans) look for the drain under the derby cover.
That plug is the drain plug for the primary and transmission oil supply.
On a 1986-2003 there is a drain hose. Look under the motor and there is a rubber hose with a worm clamp on it, it attaches to a bung on the frame. Loosen the clamp and remove the hose from the bung.
The oil drain plug is at the bottom of the oil tank (for engine). Bottom rear of primary case for primary & transmission.
It will depend upon whether you mean the engine oil drain or the Primary/Transmission oil drain. The oil drain for the engine oil is actually NOT a plug. Underneath the engine is a hose that is clamped to a boss on the frame. Loosening the worm clamp and pulling the hose off the boss will cause the oil to dump (you did put the drain pan under there, didn't you?)
My Sportster has a drain hose that attaches to the oil tank and crosses over to the opposite side of the bike. It is hose clamped to something like a lug on the bottom of the bike frame.