Hey guys, I decided to check my valve clearances as I could hear a ticking as the motor ran. they weren't bad but decided to adjust to get the hang of it. so hear goes:

1. when I pulled the valve covers off there was oil up in the covers is this normal? same for both and then I realized you fill the oil in the front so maybe it is.
2. when I reassembled she smoked like crazy. I checked the gaskets and they weren't seated correctly. After I reseated the gaskets 98% of smoke gone. I also had quite a bit of oil up in the carb and air filter is this due to gasket mishap?
3. when I pulled the plugs, the front had carbon on it but not as bad as the rear plug. neither was wet but both black. Is this okay to have one plug dirtier than the other?

I need to get a new sealing washer for the cover nut but running with only three of these on and the fourth just the nut, would this be a source of smoke, very minor smoke?

Thanks