This aftermarket cylinder barrel is designed as a direct replacement for worn factory units on compatible 50cc models.Constructed from cast aluminum with an electroplated nickel silicon carbide bore, this component restores engine specifications.The unit features a standard bore size of 39.5mm and a 40mm stroke, corresponding to part number 45230038000.It is engineered for functional equivalence to the equipment, requiring no re-plating prior to installation.This accessory fits TC50, MC50, SX50, and Pro JR models manufactured between 2009 and 2023.Please verify your existing part numbers and physical dimensions against this listing to ensure proper fitment before purchase.This product is an independent accessory and not an manufacturer part; brand names are used solely for compatibility identification.