1978 Johnson 2HP outboards Service Manual, Page 14Get this manual
2-7 BREAK-IN
The 50:1 mixture is used during break-inUse only our 50:1 lubricant or other BIA certified TC-W or TC-2 lubricantsOPERATION (FIRST HOUR): Do not operate engine at continuous full power for the first hour of operationAfter 15 minutes of slow to half throttle operation, we recommend short burst of full throttle operation every to 10 minutesRun at full throttle for about 90 seconds, then return to half throttle or less, -,' NOTE Frequently check operation of cooling system during break-inA fine spray of water discharged from exhaust relief outlet indicates proper operationOPERATION (SECOND HOUR): At intervals during the second hour, apply full power for periods of one or two minutes, reduce power to threequarter throttle for cooling periodAvoid continuous full throttle operation for extended periods during the next three hoursNOTES