O.S. Engine .12XZ and .21 V-Spec II Speed Cylinder Rebuild Kits
New from O.S. Engines: Cylinder Rebuild Kit 12XZ SP A convenient one package kit for racers! The O. S. .12XZ Speed rebuild kit features a hardened chrome-plated cylinder liner for high durability and long life. The machined aluminum piston features parallel rings that trap fuel oils and use them as a seal to enhance compression […]