This scooter timing chain is for most GY6-50 (49-90cc) models.
E-Ton (Eton) Part# 813469 812257
Tomos Nitro 50 # 14401-BE2-A000
Keeway # 140041270000
Common applications include:
Alta 50cc Alta-49 (Jonway) (Vin: TCB)
E-Ton 50cc Sport (ESport) (Vin: TCA)