Motorcycle Accessories Cylinder Bore Size 48.5mm 48.75mm 49mm Piston Rings Full Kit For CBR250 CBR 250 KY1 MC19 MC19 CBR19 Material: Metal Bore Size Options: STD 48.5mm, +25 48.75mm, +50 49mm Applicable Models: For CBR250, CBR19, KY1, MC19 Piston rings made of metal are designed for durability and efficient engine.The kit is available in three bore sizes: standard 48.5mm, 48.75mm, and 49mm, allowing compatibility with various engine configurations.This piston ring set fits CBR250, CBR19, KY1, and MC19 models, providing a precise match for engine rebuilding or performance restoration.The design supports straightforward installation as part of routine engine maintenance.cylinder condition and related components are in good working order before installation.Proper fitment contributes to consistent engine compression and smooth.