well unless some gremlins came in the night before it is ok. I flew it twice and no problem but, i havent checked the valves. I dont think they should be out yet but I might check them anyway. I am using the standard muffler. I caint say it ran perfect this time on the ground, it just was running half way decent. As far as the prop goes, I have balanced some and some I havent. This one I aint sure of. I will check that also.