Question about 2003 Harley Davidson FLHRCI Road King Classic

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I have an oil leak on my 2003 road king from a tube that comes up from the transmission & loops downward what is this from?

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With the bike standing nearly straight up, check the oil level in your transmission. There is a plug on the right hand side of the transmission that uses a large hex key or allen wrench to remove. It has a dipstick on it. Make sure your transmission is not overfilled. The hose you are referring to is the transmission vent tube and no oil should be coming out of the tube. The transmission should have 20-24 ounces of oil in it. The bike came with H-D Syn3 20W50 motor oil in it. Personally, I like the old style H-D synthetic gear lube. Seems to make the transmission run quieter.
Good Luck

Posted on May 12, 2010

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How do you repair leaking transmission oil on 2003 road king?

Take out the screws, drain the oil, remove the gasket and use brake cleaner to clean the thread holes and screws. Then put sealer like permatex on the gasket and the screws and put in back together.

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2003 road king speedometer stopped working & the mileage isn't changing either

Check to see if there is any back lighting.

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May 01, 2012 | 2003 Harley Davidson FLHRCI Road King...

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Oil plug location 2003 fat boy

On all Softails, the oil drain hose comes off the lower backside of the oil tank on the right side. It goes down behind the transmission and back out just above the lower frame tubes and the lower part of the swingarm. Depending on the year model, the hose either dead ends right there below the transmission and behind the exhaust pipes with a plug in it or it connect to a nipple on the frame at a frame crossmember that runs across the frame under the transmission. If it connects to the frame, the drain plug is directly underneath this connection on the bottom side of the crossmember.

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Jul 22, 2011 | 2001 Harley Davidson FLHRCI Road King...

1 Answer


On the Road King, the oil pan is on the bottom of the transmission. Usually the engine oil drain plug is the one closest to the left front of the pan. The transmission oil drain is also under there so make sure the right oil is coming out. If it looks too clean, you're probably draining the transmission.

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May 27, 2011 | 2003 Harley Davidson FLHR Road king

1 Answer

My harley is leaking oil from the trans vent tube ?

The transmission may have too much oil in it. The best thing to do is to drain the oil and refill. The drain is underneath the transmission. It is the drain nearest the center of the oil pan. I think on your 05 model it is like a pipe plug on the front face of the pan. Drain the oil and refill with approved lubricant. 20-24 ounces.

Good Luck

Mar 08, 2011 | 2005 Harley Davidson FLHRS - FLHRSI Road...

1 Answer

Trying to change the oil in my 2003 road king classic. Took out the screws for oil to run out but nothing is coming out. Any ideas?

The oil tank is on the bottom of the transmission. If you look under the bike, the oil drain is drain plug closest to the left front of the tank. The drain closest to the center drains the transmission. Check the oil in both the engine and transmisson before starting the engine.

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Jan 25, 2011 | 2003 Harley Davidson FLHRCI Road King...

1 Answer

I have an oil leak on my 2003 road king from a tube that comes up from the transmission & loops downward what is this from?

That is the transmission vent tube. Stand your bike as straight up as you can get it. On the right hand side you'll see a chrome cover where the clutch cable runs into it. There is a plug in this cover that uses a large hex key (7/16") to remove it. There is a dip stick on the plug. Check the level of the fluid in the transmission. If it's too full, this will cause oil to come out of the vent tube.

Mar 17, 2010 | 2003 Harley Davidson FLHRCI Road King...

2 Answers

Oil change directions, 2003 Road King

The drain plug is on the left side of the oil reservoir pointing towards the front of the bike. The motor should be warm when you dump the oil and the o-ring should be replaced as an extra precaution (don't want to waste that new oil if you have a drip). When replacing the oil filter use a piece of tin foil to divert the oil to your waste pan.

Jul 22, 2009 | 2003 Harley Davidson FLHR Road king

1 Answer

Oil weight for primary and transmission on 2003 Road King

You could get away with it for awhile, but I would only use oil formulated for the primary chain case, and for that part of the machine, I stick with Harley brand, dont forget , u got clutch plates in there u dont want slipping. For the tranny you wanna use a good grade gear oil (75W-90, 75W-110,75W-140, SAE 190 & SAE 250) .... it'll better handle the torque requirements. I use Redline Gear Oil and shifting has improved noticeably

Mar 22, 2009 | 2003 Harley Davidson FLHR Road king

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