On your Sportster, the primary oil is not fed by the oil pump. It is not even part of the oiling system of your bike. You manually put the oil in the primary by pouring it in the hole where you check your primary chain tension. The maintenance schedule on your bike suggest that the oil in the primary be changed every 5000 miles. The primary holds approximately a quart of oil. The oil that lubricates your primary also lubricates your transmission. So, if your primary case was dry, your transmission was running dry as well.
Good Luck
Steve
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