Get a YS 110 four stroke. You won't be disappointed. Mine runs perfectly and idles at a rock steady 2K rpm with only 32 oz of fuel through the engine. Check it out: [link=http://www.whitetyphoon.com/rc/h9_corsair/movies/idling.mpg]YS 110FZ Idling[/link].

In fact, all three of my 110's are like this.