I have both a GMS 47 and a Tower 46. The GMS has a Bisson Pitts muffler on it. Neither engine has ever died in flight on me. Wont even die when the throttle is closed. Only problem is that they want to sputter on the take off roll when get past midrange. Both are on warbirds so this is a pretty big problem. I am still a fairly new guy to IC having come up in electrics but I was wondering if this might be because the high speed needle is too rich coming off a good low end setting? Plan to lean them out a little tommorrow to see. What do you guys think?

Jim