One thing I've found helpful when checking oil on various bikes that I've owned, including airheads, is to always check it the same either with the oil hot or oil cold, and use the same procedure. There is a noticeable difference in volume on a dipstick when measuring hot or cold oil. An example. The oilheads I've owned where very tricky to get accurate readings and the only way I could ever get it right was after getting back from a ride, put the bike on the side stand, go away for about 10 minutes, then come back and put the bike on the center stand. Or leave the bike on the sidestand overnight ( when on the road ) and put on the center stand in the morning/ or hold the bike level, and check the oil. For some reason the oil stayed in the upper parts of the engine and took time to drain back to the sump. On my current rig if I put in the recommended amount of oil ( with filter change ) it shows about 1/4 inch overfull on the dipstick. I've taken out 1/2 litre to get it below the full mark on the dipstick. I have some ideas why and one of them is the height of the front end with the leading link and a 400x18 tire. The height at rest is about an inch higher than a stock m/c tire, not counting the height of the front suspension at rest. So I'm going to get somebody to sit on the bike and then check the oil level with the suspension compressed on the front to see if there is any difference and I am going to go back to a m/c tire on the front end. I don't know if this will change anything or not, but it will certainly change the level of the oil in the oil pan ( front to back) at rest.