If none of that works check your tunning, if your running to lean you maybe getting burn off, where the nitro evaporates immediately and the oil boils out of the fuel line as soon as it hits the carb. Your engine is WAYYY to hot if that is the case. Had that happening to me with a Traxxas Rustler along time ago, couldn't figure out why it would die all of a sudden and then not start for a long time.