RE: 4 cycle lubrication
My understanding is that oil makes its way into the crankcase via ring blow-by. I know that's the way my Saito .80 works and I've never had a bit of trouble out of it. Before running your ASP again remove the back cover and make absolutely certain there are no metal particles left over from the machining process. I've heard of those engines (and the Magnum brand from the same manufacturer, Sanye) sometimes having some machining debris still present. Also turn the engine through and see if you feel any roughness from the bearings. One thing is to make absolutely certain that your fuel has enough lubricant. Magnum (same as ASP) recommends 20% castor oil and no more than 10% nitro. Make sure the glow plug is one designed for a 4-stroke as well.
The roughness could be something as simple as an engine that still needs breaking in, but giving it a good going over never hurts.