2006 Johnson SD 3.5 HP 2 Stroke Outboard Service Manual, PN 5006562, Page 31Get this manual
INSTALLATION AND PREDELIVERY HULL PREPARATION
HULL PREPARATION
Maximum Capacity
Top Edge of Transom or Bracket
WARNING
Do not overpower the boat by installing an outboard that exceeds the horsepower indicated on the boat's capacity plateOverpowering could result in loss of controlBefore installing outboard: Refer to the boat manufacturer's certification label for maximum horsepower rating Refer to ABYC Standards to determine the maximum horsepower capacity for boats without certification labeling
Transom thickness or off-sets must also be consideredThe top edge of the transom or bracket must provide proper surface for stern bracketsThe stern brackets must contact the flat surface of the transom or bracketModify moldings or components that prevent the stern brackets from resting against the transom surfaceDo not modify transom brackets
Transom Clearances
Make sure the transom and splash well area provide adequate clearances The top edge of the transom should be wide enough to allow full steering travelThe ABYC standard for most single outboard installations is 33 in(84 cm) Check cable and hose routing clearances Make sure there is clearance for mounting bolts and washersCheck the inside area of the transom for obstructions prior to drilling holes