Can't speak for the 25 or 30 (have a 30 in a box still, waiting for an airframe) but my modern Enya 40 (SSPL) breaks nicely.
I can't recall the crankcase number (it's at home, I'm in work), but last time I had it running I was fascinated by the break. Not as dramatic as a Super Tigre on song, but still music to my ears.