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Ryder Rick has a list of other brand sport transmission oils that are made specifically for Sportsters, so he may post them if he happens along. AND GET A PARTS BOOK TOO, THEY ARE ALSO INVALUABLE.
Again this topic has been and can be debated endlessly in other threads. Ironheads run on about 6psi of oil pressure, on a good day.
One thing not to use in your transmission is modern car engine oil. Due to the roller bearing bottom end, they have a high-volume, low-pressure lubrication system. There is just no pressure there once the engine is warm.
The friction modifiers might cause clutch slip in some cases. OIL PUKING OUT BREATHER: If you start your bike up after a hot oil change and oil pukes out the engine breather, and continues to do so, you have probably overfilled the oil tank. An oil pressure gauge will only scare the hell out of you by registering no pressure, or close to it.
This plug here is removed to pour the new oil in: The special tool will not scar up the plug: 4. It is about 2 inches behind the side stand pivot, on the left, at the rear, under the clutch at the bottom of the primary cover. Tranny drain plug is this one here on the inner primary cover: Tranny drain plug has a big hexagon but a small easily boogered thread: 5. It has a small thread, going into aluminum but a large hexagon on it.
DO NOT overtighten it using the big wrench on that hexagon. I also put a smear of hard-setting Permatex on the thread just as a mild threadlocker to stop the plug coming loose. Remove the primary oil level phillips head screw, shown here in pic by Iron Mick. Have an assistant hold the bike dead vertical and fill with transmission oil (more about what that is later) until it dribbles out the level screw hole. I almost hesitate to mention this because it is always the topic of endless debate.90w gear oil is not a favourite either because it can make the clutch sticky sometimes. Drain some off from the oil tank, ride the bike, then top up the level. If the bike has not been run for a week or more, the oil can drain down into the sump and puke out the breather a bit on start up. TWO SEPARATE LUBRICATION SYSTEMS An Ironhead has two separate oil sytems, engine and transmission, so needs two oil changes before you go ride anyplace on that new bike.Old oil that has been sitting for years can do damage right from jump street, so you should change that oil before firing up for the first time.THE TRANSMISSION OIL This is separate from the engine oil. DO NOT take any drain plug out of the bottom of the sump of the engine, at the front, under the crankcase. Repairing that thread properly can require splitting the crankcases and you don’t want to go there. When all oil has drained out of the oil tank, put the oil tank drain plug back, with a new copper washer on it to seal it. I like the drop in filters from JP Cycles (JP part no 7400225) with the pleated automotive style element and spring loaded bypass valve. I had to cut my dipstick down to fit it, right on the low mark, so that is ok.