1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 107Get this manual
Installation
1Install the flywheel key:
[]] 9.915Install the key with its outer edge parallel to taper of crankshaft
W 20 thru 30 -
Install the key with its outer edge parallel to centerline of crankshaft and single upset mark facing down
2Clean the crankshaft and flywheel tapers with OMC Cleaning Solvent and let dryThese surfaces must be clean and dry to allow proper locking of the tapersDR2115