One of the joys of Chinese machines is that they require a bit of "fettling" to make them perform their best. Mine does do the full 25"X 15"Y, 12"Z, but it required re-locating the home sensors, and perhaps a few other things, to get full travel. If you have the old stand/trays, you'll also need to shorten the X motor cover. Getting full X travel requires over-travelling to the right, such that 5-6" of the saddle ways are exposed on the left. IIRC, you also have to move the front attachment of the front Y bellows closer to the front wall of the enclosure. On mine, I actually bolted it (using thumbscrews, for easy removal) to the front wall of the enclosure. This allows me to detach the bellows and easily clean under them.
Regards,
Ray L.