Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 97Get this manual
Powerhead Break-In ACAUTION
To avoid possible engine damage, "Break-In Procedure," following, MUST BE completed BEFORE operating engine at full throttle continuouslyBREAK-IN FUEL MIXTURE (WITHOUT AutoBlend) During the break-in period(refer to BREAK-IN PROCEDURE) operate your outboard motor on the first 15 gallons of fuelby mixing gasolineoil in the fuel tank at 25:1 ratioas described in the 25:1 BREAK- IN FUEL MIXTUREWITHOUT AutoBlend chartAfter the 15 gallons of 25:1 break-in fuel has been consumedmix gasolineoil in the fuel tank at 50:1 ratio for normal operation, as described in the 50:1 NORMAL FUEL MIXTUREWITHOUT AutoBlend chartBREAK-IN FUEL MIXTURE (WITH AutoBlend) During the break-in period, (refer to BREAK- IN PROCEDURE) operate your outboard motor on the first 15 gallons of fuel, by mixing gasolineoil in the fuel tank at 50:1 ratioas described in the 50:1 BREAK-IN FUEL MIXTUREWITH AutoBlend chartNOTE: The 50:1 ratio gasoline-oil in the fuel tank combined with the metered oil ratio supplied by the oil injection system will supply the necessary gasolineoil mixture required for break-in lubrication After the 15 gallons of 50:1 break-in fuel has been consumedit is no longer necessary to mix oil to the gasoline in the remote tank, for normal operation