1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 33Get this manual
Break-In Procedure Standard Fuel TankUse 25:1 fueloil mixture for the first 12 gallons of fuelOptional AccuMix Oil Injection SystemUse 50: fuel oil mixture in addition to the AccuMix system for the first 12 gallons of fuelTo help ensure long engine life and prevent serious engine damage, using additional oil in the fuel is mandatory during the first few hours of operation of: new engine used engine with new powerhead used engine with newly rebuilt powerhead INotel DO NOT operate motor out of waterWater pump can be damaged or engine can overheatI Note DO NOT operate engine at constant throttle settingChange engine RPM oftenFirst 20 Minutes Operate engine in gear at fast idle ONLYDO NOT exceed 1500 RPM Verify water pump operation by looking for steady stream of water at the water pump indicatorNext 40 Minutes _
DO NOT operate engine above 12 throttle (no more than 3500 RPM) DO NOT hold constant throttle settingChange engine speed every 15 minutes Verify water pump operationINotel With easy planing boats, use full throttle to quickly accelerate boat onto planeImmediately reduce throttle to one-half as soon as boat is on planeBE SURE boat remains on plane at this throttle settingNext Nine Hours _