Heres a pic of my sons 30cc homy in his 84 inch Balsa USA DVIII.11-12 lbs if i remember right.Flys it real nice,and a hair above scale.Hand starts on th 2nd-to 3rd flip even cold.Mines the short shaft version.Home made pitts muffler.I was running an 18x8 dynathrust so i know the performance of the engine could be better.I know it was about 7000 rpms though.I recieved the engine used and never changed it at all.Just converted and stuck it on there.Might need new rings,dont know.Works good enough.