Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 57Get this manual
Idle Speed Adjustment Adjust engine idle RPM as follows: aWith engine in water, connect electrical harness and fuel line to engineStart engine and allow to warm upbWith throttle cable barrel removed from barrel retainer, adjust idle RPM to 500-650 RPM with engine running in forward gearRetighten nut on adjustment screwcWith end of throttle cable connected to throttle lever, hold throttle lever against idle stopAdjust throttle cable barrel to slip into barrel retainer on cable anchor bracket with very light preload of throttle lever against idle stopLock barrel in placedCheck preload on throttle cable by placing thin piece of paper between idle stop screw and idle stopPreload is correct when paper can be removed without tearing but has some drag on itReadjust cable barrel, if necessaryIMPORTANT: Excessive preload on throttle cable will cause difficulty when shifting from forward to neutral(Readjust throttle cable barrel, if necessary
Fuel Pump