Drive, 11-Tooth A: 12.90, B: 37.80, C: 46.30, D:φ12.10, E:φ13.00, F: 6T Gear Busing( Ø12.10 x L 13.00 ) ID Hitachi S108-80, -80A, -80B ; Yamaha 689-81800-11, -12, -13