Basically yes. It may run in Enya's and YS, but I could not get it to idle well on an OS .91FS. I could get it to idle but not well. The OS .91FS ran about as well on an A3, which I have tried in a pinch, runs but you have to settle for a higer idle speed. I think the Enya is a bit better though. Compare that to the K&B 4C which is obviously colder but idles well.