The 25fx is a very popular Open B and 2548 engine and no mystery why. They run great, needle good, and take lots of abuse.

With a moose can, it is in my opinion the most user friendly open B engine ............too bad they discontinued it. Same thing applies to 2548.

I haven't tried one yet, but I hear that the 25AX is a dog turd..........looks like the OS folks may have fouled up.

I have Webras and they run great too.

You gonna be at Lone Star Combat Nats?