Originally Posted by
vertical grimmace
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.
The FX II has the same compression as the FX at least on my tach. The FXII Copies the AX carb/HS needle design. I always got more RPMs/power out of the FX engines opposed to the AX. So basically the FXII gives the you the power of an FX with the convenience of the angled back HS on the carb.
I'm sorry the ASP is not on par with O.S. engines for the following reasons:
1.) O.S. produces more power than the ASP's. This according to my own taching, tuning and flyying.
2.) The O.S. deign is much more convenient. The ASP carb nipple is too close to the engine mount holes. This makes mounting the engine cumbersome and you risk breaking off the nipple.
3.) After having disassembled and reassembled both engines I can tell you that the O.S. components are of higher quality. I have a lot more confidence in the O.S. engines to Survive mid-airs, crashes and hard landing than the ASP.
The one advantage the ASP does have is it's price. It's only 1/3 the cost of an O.S. but it is not the same product.