i see in the pics it looks like you have copper tubing or something blocking the crankcase hole, how did you go about perminantly blocking it off? i see you have it set up for EI, which system did you use? this is my first gas engine, and conversion so i do not know much about them yet, how much if possible would it be to make a muffler for me. i have a lot of ideas but dont know which way to go (the cheaper the better, but still reliable) i also have been told thad needle bearings are not that good for aircraft engines? any discussion on that? thanks again for all the help!!