For 5HP S/N (0R936270 & Up) I 9.9HP EFI S/N (1R008146 & Up) I 10/15HP EFI S/N (0R833820 & Up) I 15HP EFI 2 Cyl. S/N (0R833820 – 1R162636) I 15HP Sea Pro S/N (0R833820 & Up) I 20HP EFI S/N (0R833820 & Up) I 25/30HP EFI 3 Cyl. S/N (1R154758 & Up) 2.17:1 I 30HP S/N (0G575500 & Up)