Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 349Get this manual
4) Apply the sealing agent (silicone sealant) to.the bolts and the bolt holes5) Remote control box type: Attach the outboard motor on the hull TRANSOM BOARD TOP
CAUTION: If the outboard motor is the remote control type, connect the steering guide cable the outboard motor before installation6STANDARD HANDLE TYPE AND LONG TILLER
HANDLE TYPE: Secure the outboard motor with the commercially available four 10 bolts, eight 10 mm washers (small), four 10 mm washers (large) and the four 10 mm self-locking nuts