Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 9Get this manual
Break-In Fuel Mixture (Without AutoBlend) During the break-in period, (refer to BREAK-IN PROCEDURE) operate your new outboard motor on the first 15 gallons of fuel, by mixing gasolineoil in the fuel tank ata 25:1 ratio, as described in the 25:1 BREAK-IN FUEL MIXTUREWITHOUT AutoBlend chartAfter the 15 gallons of 25:1 break-in fuel has been consumed, mix gasolineoil in the fuel tank at 50:1 ratio for normal operation, as described in the 50:1 NORMAL FUEL MIXTUREWITHOUT AutoBlend chart
For the next five hours of operation, full throttle operation may, againbe attained, but it is strongly not recommended for sustained use(More than minutes of continuous wide open throttle