I was changinf fluids on my 04 Ultra. i removed a drain plug on the right front of the engine, some dirty oil came out, not alot. cannot find where to refill.

Your bike has oil in three seperate areas. The engine, primary, and the transmission.To check the oil level in your engine it's the large knurled cap on the corner of the transmission with the LONG dipstick. To check transmission fluid look for the chrome clutch release mechanism on the right side of the bike. If you can't find it, simply follow the clutch cable until you get to where it goes into the transmission, that's it. In that cover, there is a large plug that requires a 3/8" Allen or Hex key to remove. It has a dipstick on it. Keep the fluid level between the two marks. Check the level with the bike standing straight up.
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To check the primary level, remove the derby cover and stand the bike straight up. The oil level must be no higher than the lowest point on the Clutch Spring. The aluminum outer clutch basket is made of bright aluminum, the clucth spring is a darker colored steel disc. Fill the oil no higher than the bottom of this disc. If you do, the clutch will drag and you will not be able to find neutral with the engine running. ---------

Changing fluids is good, but a mere portion of the things that need to be checked, adjusted, tightened and lubed.The plug at the bottom rear of the primary cover is the primary chain-case drain.You should not remove this cover unless it is leaking or you need to get into the primary chain-case to adjust the primary chain or for something else. fresh fluids are added through the derby cover (clutch inspection cover) and the primary chain tension is inspected through the rectangular cover near the heel shifter.On the bottom of the transmission case you will find the engine oil drain plug at the front, lower edge, facing the engine.The transmission drain plug is on the right side of the oil pan and up near the frame rail.You may need an inspection mirror to find it.You will need 1 qt of primary chain-case lubricant for the primary, 4 qts of engine oil for the engine (through the dipstick hole) and 20-24 oz's of gear lube through the Allen plug on the top right side of the transmission side cover add about half then check the level. Ease up on the fill mark. If you over fill it, the excess will blow out the transmission vent.Do not put engine oil in your transmission. It does have adequate shear strength to protect the gears.--------- The transmission oil goes in through the plug on the right hand side of the bike the clutch cable enters underneath.Fill primary oil in through the rectangular cover near the heel shifter.---------------

This should help.Thanks.Helpmech.