This gasket mat repair pad set and piston rings kit is compatible with CB400SF, CB400 VTEC, CBR400, CBR400 NC23, and CB-1 motorcycles.It is designed for 4-cylinder engines and includes components for a complete engine overhaul.The kit contains four cylinder piston rings and one overhaul gasket kit.Specifications match standard dimensions: bore diameter 55 mm, wrist pin diameter 14 mm, and total piston height 40 mm.Part numbers supported include 13101-MY9-690 and 113101-MCE-000.The set fits models from 1988 to 2014, including CBR400 NC23 (1988–1989), CB400SF (1992–1998), CB400 VTEC (2000–2014), CB-1 (1989–1991). Notice: This replacement item is produced by an independent supplier.All brand and model mentions are for compatibility purposes only.