1989 Johnson Evinrude "CE" 9.9 thru 30 Service Repair Manual, P/N 507754, Page 120Get this manual
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Functional TestsS.L.OWTM The 20 thru 30 HP ignition system incorporates the S.L.OW.TM warning system which will limit engine speed to approximately 2000 RPM when engine temperature exceeds 1800 (82 C)