excessive valve noise 4 stroke ideas??

[maxximus]

350x bandit w/fat web cam...all of a sudden valves sound double as loud as usual.
not many hours on motor.

How often do the valves need adjusted? or other possibilites..

Thanks
:grr

[redrider ex]

i would check them and see how loose they are

[4TraxRider]

Check them to see if they are loose.