My OS 75ax...when I run it wide open and stay in the throttle for awhile...it wants to shut off....sometimes if I can tell its gonna happen I can back off the throttle and it recovers fine...but sometimes it shuts off. I dont think it is running to lean, it blows plenty of smoke and excess fuel comes out of the exhaust and the engine stays nice andcool. Could it be running to rich and when its wide open be dumping too much fuel to burn and be loading up? Do I need to mess with my low speed needle? Or high speed needle? Run it richer or more lean? It is running great but like I said....if you stay in the throttle for a long stretch it tends to want to die out and shut off. Any help would be appreciated.