1st time changing oil on 2005 classic. looking for the drain plug also how much oil just for engine not trans, thanks

get a pro full flush or only 1/3 the ATF will be changed.

drop pan, (huge flood if no drain plug)
replace filter.
put back new gasket with pan. (add drain plug now if missing)
connect full flush system to lines on trans.
turn on flush sys.
then follow instructions on said system.

the DIY way (done many a time.
is same but add in back the same exact oil drained
then drive 10 miles.
drain/fill again,(plug pull) if not pink
repeat until ATF looks pink/red, or till tummy feels happy.

Clean all oil from the bike exterior. Leave it sitting in an upright position for a period of time. This may require a bike lift or other such device. Then look for leak source. Make sure oil level is not too high. When changing oil it often gets on the cross member and may leak when on the jiffy satnd for a while until it is all gone from this area. Make sure to always use thread sealant and a good o-ring on the drain plug.

The RK oil tank is on the bottom of the transmission. the drain plug is near the center of the oil tank. There is also a transmission drain on the side of the oil pan. Loosen the plug just enough to allow a little oil out to make sure you have the correct plug before you take it completely out. It take three quarts of oil with a filter change.

Steve

You won't find an engine oil one, it has a dry sump and is located on the oil tank.
The gearbox however has one, under the engine between the gear change lever and oil pump.

On the bottom of your transmission, there are two drain plugs, one for the transmission and one for the engine oil. The plug in the center is the transmission drain plug and the one toward the left front is the engine oil drain. The primary drain is a small pipe plug that takes a Torx wrench located at the bottom of the primary cover towards the rear of the bike.

Engine oil three quarts with filter. Then start the bike and let it run for a few minutes. Shut down the engine and check the oil level with the dipstick. The dipstick has two marks on it. "Full Cold" and "Full Hot". Fill to the full cold mark.

Transmission takes 20-24 ounces of oil and the primary takes 38-44 ounces of oil. Do not overfill the primary as it will cause your clutch to drag. All three sections take H-D Syn3 20W50 synthetic engine oil.

Look under the transmission. This is the oil pan. There are two drain plugs. The one in the center is the transmission drain plug. The drain plug near the front on the left side is the engine oil drain plug. Three quarts of oil with a filter change then check the level on the stick. There are two marks on the dipstick. One is "Full Cold" and the other is "Full Hot". Do not overfill.

The plug ( 3/4 wrench ) under the trans when your looking at the trans cover ( right side of the bike ) is the trans. If you drained that replace it with 24 oz. of either HD trans fluid or I prefer Golden Spectro 75/140 ( much better shifting on a Harley ( trust me you'll never go back to HD trans fluid ) the drain for your motor oils is on the same pan ( on the bottom ) but it's the plug facing the front of the bike. Looks just like the trans plug. Both use a 11105 o ring which you should replace everytime ( just for piece of mind as well as leaks ) you need 4 quarts of 20/59 HD oil. Hope it helps.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb

Another way to locate it, is with the bike on the kickstand, look underneath of it from the right (brake) side. The oil drain plug is on the front of the square looking pan under, and to the rear of the engine. The oil drain is the plug on the front of that pan, on the left (shifter) side of the bike. The trans drain is on that same square looking pan, but towards the right side, and faces down. It screws in and out vertically, whereas the oil drain is horizontal

1.Get your supplies ready and expose your engine 2.Unscrew the Oil Filler Cap 3.Remove the Oil Drain Plug 4.Remove and Replace the Crush Washer 5.Clean the Oil Drain Plug 6.Remove the Oil Filter 7.Remove and Clean Plastic Mesh Filter 8.Lubricate the O-ring of the New Filter and Attach it to the Engine 9.Motorcycle Oil Change - Replace Oil Drain Plug & Plastic Mesh Filter Pour Oil 10.Check the Oil Level,,