So is the .25 FX II the same as a .25 AX? It does not seem either was made available in the U.S. for very long or if at all. The OS website and Tower show the .25 FX as discontinued. Funny, RC combat is what brought the .25 FX back to market a number of years ago. But OS had to raise the price. The real solution is to just get a Magnum .25 XLS or the ASP .25. They are all copies, and run as good as the OS engine. I would prefer to have the needle on the carb. But overall, it is disappointing to see these wonderful engines disappearing. I feel the OS .25 FX to be one of the best engines OS produced. I have had at least 10 of them total.