I was using Cool Power 15% with 18% oil (I think, the label has faded so I can't tell for sure). I had this engine checked by couple fo guys at our field and they did not think it was too lean. It was spitting out some oil residue out of the muffler.
Could the head bolts lose their torque by temperature cycling? Would it give me any indications if they were loose?

I think I will wait with the dissassembly untill I get myself a dedicated pot and make sure that my wife will not be home as I am cooking my engine in her kitchen.