no, I never touched the needles, It ran good cold but bogged alil while getting to full rpm, and 2 times it just died almost after a few seconds at high rpm, but i chopped throttle and it didnt do it, but both times after a wild twist or snap. probbably that was a buble but the low is probably lean, seeing when i got it new it was summer when it was sent from ceremark so it makes sence, I will give it a lil more next time out. My maiden flights were great though, I love it already.