for Suzuki GT550 Bj. 72-77 with original Mikuni carburetor
Keyster = KYV-03025
OEM = 13370-18111
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.