1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 31Get this manual
Service Policy
When servjcjng an outboard which is within its normal warranty period or covered by the OMC 1+2TM Extended Protection Plan, repairs should be made using only OMC genuine replacement components or partsIf OMC genuine replacement components or parts are not used, OMC might refuse subsequent warranty claims involving that engine
JWhen replacement parts are required, use genuine OMC parts or parts with equivalent characteristics including type, strength, and materialFailure to do so may result in product malfunction and possible injury to the operator andor passengers