Question about 2004 Harley Davidson FLSTC - FLSTCI Heritage Softail Classic

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I think I have identified the sump drain plug on my 2003 Heritage Softail. Is it a hex head plug on the bottom RH side of the crankase? If so, it is screwed in ridiculously tight. I don't want to strip the plug. Am I on the right plug, or is there a hose somewhere else?

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  • Master
  • 4,565 Answers

No, I don't think you're on the oil drain plug. Harley motorcycles use what we call a "dry sump" oil system. This means that the oil is not carried in the engine but rather in a remotely mounted tank. In a wet sump engine, the oil is in the bottom of the engine, like on a Honda or in your automobile.

On your Softail, find the oil tank. Now look for a hose that comes from the rear lower left side of the tank and goes down to the frame just below and behind the chrome end cover on our transmission on the right side of your bike. There is probably a clip on the frame that holds the hose and there is a plug in the end of the hose with a hose clamp on it. This is the oil drain hose. Loosen the clamp, remove the plug, and the oil will drain out of the tank. This is where it used to be. I'm not being sarcastic but I don't often work on the later models. I work mostly on the models made prior to the year 2000. I hope this helps.

Posted on Nov 12, 2009

Testimonial: "I found it. It is actually a hard line with a screw-in plug."

  • wd4ity
    wd4ity Nov 14, 2009

    Then they've upgraded it. I only work on bikes that are older than 1999 models, Evo engines and earlier. I do not work on Twin Cams. Got to leave something for the local Harley shop to work on. Those mechanics have got to eat too. Glad it worked out for you.

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