Call up your Dealer and ask them. http://www.fisherhonda.com/honda-factory-recommended-maintenance-schedule-30k-60k-90k-120k/
Look at page 347 in your owners manual. Says to adjust only if noisy, for what ever that is worth.
The gen 1 crvs had problems with the exh valves receding into their seats and that problem has been corrected in newer gens.
I haven't heard much about adj the valves on your gen of CRV.
Do some Internet searching for the correct answer, probably going to the MM