The site I used is
Honda Engines offers high-quality power units for a wide range of applications such as construction equipment, generators, lawn mowers etc.
www.honda-engines-eu.com
But as you see from the screen shot it says it is the GX690RH and not the GX690RHX. The GX690RHX don't even list the TXA2 type code.
If you got a different site then let me know what it is as I would use it but I am not a dealer for Honda; just an independent shop.