Yamaha - Gear assy, starting motor - 7CP-H1807-10-00Yamaha Starting Motor Gear Assembly Engine Starting Component 7CP H1807 10 00 Overview When you hit the key, this is one of the parts doing the real work behind the scenes. If the starting gear isnt engaging right, youll hear itgrinding, slipping, or just nothing happening at all. Ive seen engines that wouldnt turn over simply because this gear assembly was worn out. When its in good shape, starts are quick, smooth, and consistent every time. Key