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I've gone through this a hundred times in this forum. The 2.5 is a reliable engine IF YOU CHANGE THE HEAD. The stock head that it comes with is absolutely the pits. If it can't maintain a consistant temp, you can't maintain the tune. There's not much difference between the 2.5 and the Revo 2.5R, but the Revo just runs and runs, without any tuning issues. Ever wonder if that has anything to do with Traxxas putting a CNC head on it?