1989 Johnson Evinrude "CE" 9.9 thru 30 Service Manual, P/N 507754, Page 107Get this manual
Installation 1Install the flywheel key:
9.9 thru 15: Install the key with outer edge parallel to taper of crankshaft 20 thru 30: Install the key with outer edge parallel to centerline of crankshaft and single upset mark facing down2Clean the crankshaft and flywheel tapers with OMC Cleaning Solvent and let dryThese surfaces must be clean and dry to allow proper locking of the tapers