How much oil does a 2003 sportster primary require?

Answer 1

A 2003 Sportster requires one quart of "Sport-Trans" oil. Unlike the Big Twins, Sportsters lubricate the primary, transmission, and cams from the same oil supply. To replace, run the machine to normal running temperatures. Then, after putting the oil drain pan under the machine, remove the drain plug. It is on the primary side of the engine, near where the jiffy stand attaches to the frame. While allowing the oil to drain, closely look at the tip of the drain plug; it is magnetized. If you see metal filings, that is ok, and indicative of normal wear. Larger pieces of metal is a sign of a serious issue. Also, check the small o-ring for wear. Usually it is a good practice to replace it. Once all of the oil has drained, replace the plug and remove the derby cover (be careful; the Motor Company made the attachment bolts out of a soft form of butter, and they are easily stripped) and refill with one quart of Sport-Trans. You will most likely need a helper for this, because with the machine laying on the stand, it is hard to pour the oil in. This would be a great time to check the tension in the primary chain, by the way. Consult your Service Manual for more details on this.