Hi Guys, I have a 30 cc homie with a new cylinder and a 2 ring piston. Compression is very good and it seems to like the 24 over the 28. It idles better although it is still in need of more break in time. My best idle speed so far is only 2200. Top end is 7000 with the 28/64 and 6900 with the 24. the prop is a APC 18/6W.