On the ST1300, I believe they need to be checked every 16,000 miles. I'd guess the CTX1300 would be the same. 
In point of fact, Harley is my least fave bike in the entire world and would not accept one if gifted if I could not sell it and had to give my up other bikes in order to have it........I guess the only people asking that question are former H-D owners, right? No offence intended, H-D is known to use hydraulic lifters in most (if not all) of its engines, so if that's your only experience the question comes natural.
However I don't remember seeing any Japanese bike with the same setup, so the question is somewhat hilarious in this realm, where all of them need some form of periodic adjustment.
I apologize if I came across as arrogant, it was never my intent :| All my past experience with Japanese bikes involves engines without hydraulic lifters (be them rocker arms or shim-and-buckets).I am happy to have added some hilarity to your reading..
Best,
Bob
Did, it is 16,000 miles interval. It may not need inspection as often as that, and will likely as not need no actual adjustments so soon, but Honda kept the same interval.This is a valid question, I would think the valves on the detuned CTX engine would require a much later requirement, like, 25000 mile? You guys that already own a CTX1300 can you look in your manual at the service interval chart and let us know please?...
Add the Honda Shadow Aero 1100 to the list.However I don't remember seeing any Japanese bike with the same setup....