After further investigation they are probably 18 to 23cc engines. I cannot find any markings at all. The carb has RUI*ING and the nubers on it are 307121014. The flywheel has the cooling fins on the inside towards the engine and the adapter for the carb is not pictured. Does it look like this engine could possibly use any conversion parts designed for another brand such as homelite, Ryobi? The coke can is for comparison purposes, it is not part of the engine[sm=wink_smile.gif]