Where is the drain plug on a 2004 dyna lowrider?

The drain is under the crankcase. Please review the video I'm attachi
.A thumbs up would be greatly appreciated if this answer is helpful to you.

Your engine is a dry sump engine, the oil drains at the TANK and not at the engine.

Your dyna should take three quarts of oil. The oil level will be above the "FULL HOT" mark until you start the engine and fill the new oil filter with oil. Start the engine and run it for one minute. Recheck the oil level with the dip stick. It should be in the safe operating zone. Do not top off the oil level. Do not add oil until it drops to that Add One Quart level.

Good Luck
Steve

On all Dyna series bikes, the oil pan is on the bottom of the transmission. The oil dipstick is on a corner of the transmission. It''s a large diameter, about 2 inches, plug with knurling around the edges. Pull this out and the dipstick is attached to this plug. It's got two marks on it. The top mark is "FULL HOT" and the lower mark is "FULL COLD". Do not overfill.

Good Luck
Steve

The oil tank for your Dyna is on the bottom of the transmission. The oil drain plug is the one closest to the left front corner of the pan.

Good Luck
Steve

There should be a drain plug on the trailing side of the slider. Some have cross point screwdriver heads on the plug others have allen or hex head plugs. Remove the plug and work the forks up and down. If all fails, you can remove the entire tube and turn it upside down.

Bleed the brake system adding new fluid until the new fluid comes out in to your bleeding bottle you just changed it.

Look on bottom of crankca
.A thumbs up would be greatly appreciated if this answer is helpful to you.