Oil thread.

[SteveD]

An old B&S article which may be of some interest.
http://www.omnilex.com/public/bmw78/boxloob.pdf

[daz]

I use Oilzun!

[daz]

Make that Oilzum!

[hal]

Great, thanks!

[jagarra]

In my airhead I use 20/50 Castrol, in my oilhead I use Liqui Moly full synthetic.

[George Ryals]

SteveD, that's a great schematic of the oil system of an airhead. However, there are two other oil passages that are missing from the drawing. I don't know if all airheads have them, but each cylinder spigot hole in the case has a tiny oil passage maybe 1.5-2 mm dia that runs down from the center of 13 & 14. These oil passages match up with a groove around the cylinder spigot . There is a tiny hole from the groove to the interior of the cylinder that oils the piston skirt.