ARCO NEW OEM Premium Replacement Outboard Starter Fits Yamaha 1987 - UP 30 HP, 1989 - UP 40 -50 HP, 11 tooth drive gear. Replaces Part Numbers: Yamaha 6F5-81800-10 Yamaha 6F5-81800-11 Yamaha 6J4-81800-00 Yamaha 6J4-81800-01 Hitachi S108-87A