for Suzuki GS1100 Bj. 80-81 with original Mikuni carburetor
Keyster = KYV-29S20
OEM = 13370-11400
OEM = 13370-44080
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.