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Sportster Primary Oil Capacity. It helps to use a funnel designed for a primary case. The primary/transmission oil supply is drained by a plug at the bottom of the primary case, near the back.
2016 XL883L Sportster Low (Roy Henderson)
Unless your bike was abused (raced), your Sportster. A grounded oil signal switch wire, faulty signal switch, damaged or improperly installed check valve and/or trouble. To change the oil, drain it, and then dump in a quart.
Everyone who owns a Sportster should have the OFFICIAL Harley Davidson Sportster service manual.
Remove the two screws that hold the primary chain inspection cover on.
oil capacities on a fatboy - Harley Davidson Forums
2012 Harley-Davidson Sportster Seventy-Two | Top Speed
But it also states that when changing oil, you do not need to drain the case, just the oil tank. I hope this helps you learn to do this yourself. Engine Oil Change, Oil Specs, Aftermarkets and Comparisons.