for Honda XL600V, PD06 with original Keihin carburetor
Keyster = KHV-18026
OEM = 16011-MF5-671
please check and adjust float valve level if you chang float valve.
level data you find by Keyster carburetor parts in this shop, search your model.
please clean your petrol system
change complete set, not only new valve in old holder.