Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 319Get this manual
cInstall throttle cable into tiller handle port until movement is felt in drive rod eRotate drive rod counterclockwise 14 turn (90) until flat surface becomes parallel with work surface
dRotate drive rod counterclockwise 18 turn (45) until flat surface becomes parallel with work surfaceMeasure distance between tiller handle port and end of throttle cableA measurement of 15-78 in(40.3cm) must be attained for throttle shutter plate to open and close properly