A related series of questions might be useful here:

1) Can 4 stroke glow engines (OS, Enya, magnum, YS, etc...) be run inverted?
2) If the answer to #1 is yes due to the oil content of the fuel, can the same principle be applied to 4 stroke conversions?
3) If the answer to #2 above is yes, does it make a difference if the ignition/fuel mix is magneto (gas), gas / glow, or just glow (alcohol / oil)?

I'm really interested in the feedback on this one.

Thanks