Rocker Arm Assembly (Type 1, 64mm); QMB139

The rocker arm assembly for Type 1 QMB139 engines.Type 1 has a shorter head and 64mm valve stem length.If you have 69mm valve stem length and a taller head, you have the Type 2 engine.chances are your scooter is newer and/or was made by Zhejiang ZhongNeng aka Znen. Product is intended as OEM equivalent for listed models.Any misuse, alteration or alternative application is prohibited by law.