I was getting my Ghost ready for the maiden flight and did the first start of my IL-230 in the air frame. The engine ran really rough. I couldn't get more then 3,000 RPM. I brought plane and during the inspection, I removed the 3 crankcase covers and found parts of rubber. you can see in the photo. Looks like it came from some sort of gasket maker material. I'm assuming this was the cause of the rough engine and have to assume that one or more carb's have sucked some of this stuff in. Any thoughts or suggestions?