1988 "CC" Colt / Junior thru 8 Models Service Manual, P/N 507659, Page 58Get this manual
Break-In Procedure Use 50: fueloil mixture in the fuel tankUse only Evinrude or Johnson Outboard Lubricant, or other NMMA certified TC-W lubricants, at ratio not leaner than 50: 1First hour: For the first 5-10 minutes, operate engine at fast idleFrequently check operation of water pump5-8 modelsThere should be steady stream of water from the overboard indicator at the rear starboard corner of the lower engine coverFor remainder of first hour, engine should be operated at boat planing speedDo not operate engine over 3000 RPM, or approximately half throttleChange engine speed every 15 minutesWith easy-planing boats, bring the boat into planing position with full power and then immediately reduce the throttle setting to approximately 3000 RPM (half throttle)BE SURE boat maintains planing attitude at this throttle settingSecond hour: Bring boat into planing attitude and reduce power to 4000 RPM, or approximately three-quarters throttle, while maintaining planing attitudeAt intervals during the second hour, apply full power for periods of one to two minutes, returning to threequarters throttle for cooling periodChange engine speed every 15 minutesHours 3-10: Avoid continuous full-throttle operation for extended periods during the next eight hoursChange engine speed every 15 minutesRetorque cylinder head screws after engine break-in periodRetorque after engine has been run and cylinder head has cooled to the touch