
Manufacturer reference: YA5378
Replacement sleeve for Yamaha YZ125 (models 1999-2000) by LOS ANGELES SLEEVE. Designed for motocross riders who are overhauling their top-end, this sleeve fits into the original cylinder and ensures proper guidance of the piston and rings during engine servicing.
An essential base part during an engine rebuild or after wear/overheating, this sleeve allows for correct clearances between the piston and cylinder and facilitates boring or reassembly operations. Installed in a top-end kit, it finds its place at the heart of the engine block to ensure consistent engine behavior and controlled longevity when installed according to specifications.
Check the cylinder type (5ET / 5HD / 5MV) before ordering for a hassle-free installation. Ideal for tuning enthusiasts and motocross riders who demand a reliable replacement part for their YZ125.