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Harley has changed the location of the oil drain on Sportsters so many times it's hard to keep up with. Look on the left hand side down low on the frame behind the primary. The hose simply plugs onto a stub on the frame.
Yes the primary case-transmission require it's own oil as the lubricant for this area is not provided by the engine oil. There is a drain plug located at the lower point of the case. Remove the plug and drain any oil that may be in the primary case. When finished, add one quart of oil to the case through the access hole at the top of the primary case where you check the tension on the primary chain.
There may be an oil level hole on the rear edge of your primary. This is a plug that you can remove and once you fill the primary to the point to where it starts running out of this hole, the primary is at it's proper level. I alway add the primary oil through the same hole that you check the tension of the primary chain through. Drain the primary and refill with a quart of oil. If you get the primary too full, the clutch will drag and you will not be able to find neutral with the engine running.
Look on the left side of the bike somewhere below the battery and behind the primary cover. You'll see a hose with a plug in it or a hose that simply plugs onto a stub on the frame way down low on the frame.
On a Sportster, the transmission and primary oil are the same. There is a drain plug underneat the bottom of the primary at the rear. The primary oil is added through the upper primary chain tensioning access hole at the top of the primary. Add about one quart of Primary and Transmission lube for Sportster. I'd recommend H-D oil.
Yes, there is oil in primary and transmission of your Sporty. To drain the oil, look for the drain plug on bottom of rear section of the primary area, back near the large round section of the primary. Drain the oil here and replace the plug. Add the oil at the top primary chain inspection port, large plug with a large "screwdriver" slot or two small bolts in it. Add 32-36 ounces of H-D "primary lubricant for Sportsters".
There is a hose that comes down between the rear down tubes on the frame, it goes back and attaches to the the frame. It doesn't look like it should be a drain hose but it is. Make sure you bring the temp up on the bike before you drain the oil and check the oil tank before you refill, I usually need to use a turkey baster to remove the last of the old oil out of mine. When you refill the tank make sure to only fill it to about hal lf way between the low and full marks on the dip stick to reduce blow by. Also don't forget to put about 4 ounces in the oil filter to prime the motor.
The sportster only has two oil fills. The engine oil fill is through the dip stick hole I use mobile 1 15-50. The primary fill is the upper access plate on the primary cover I use mobile 1 gear lube 75-90.
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