Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 347Get this manual
IDraw the center line on the boat transomNOTE: The boat is symmetrical with respect to the keelIf the boat has no keel, measure the transom width and draw the center line 3) Calculate the outboard motor installation heightOutboard motor installation height must be in the range between50 mm (0- in)Determine the outboard motor installation height by subtracting the boat transom height from the outboard motor transom length
BF25DIBF3OD TRANSOM LENGTH: type: 431 mm (17.0 in) type: 552 mm (21.7 in) BOAT TRANSOM
AUXILIARY EXHAUST PORT
CENTER LINE
2) Measure the transom height of the boat
PLATE WORKABLE TRANSOM HEIGHT: type: 381 431 mm (15.0 17.0 in1 type: 502 552 mm (19.821.7 in)
0-5Omm(O-2in)