1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 204Get this manual
6Install upper drive shaft housing cover and secure cover with bolt, nut and flat washer Break-in Procedure
! CAUTION
Severe damage to the engine can result by not complying with the Engine Break-in ProcedureMODELS WITH OIL INJECTION ngine Bre ak-in uel Mixture Use 50:1 (2) gasolineoil mixture in the first tank of fuelUse of this fuel mixture combined with oil from the oil injection system will supply adequate lubrication during engine bre ak-inE ngine Bre ak-in Procedure Vary the throttle setting during the first hour of operationDuring the first hour of operation, avoid remaining at constant spe ed for more than two minutes and avoid sustained wide open throttleMODELS WITHOUT OIL INJECTION ngine Bre ak-in uel Mixture Use 25:1 (4) gasolineoil mixture in the first tank of fuelE ngine Bre ak-in Procedure Vary the throttle setting during the first hour of operationDuring the first hour of operation, avoid remaining at constant spe ed for more than two minutes and avoid sustained wide open throttle