2001 Mercury Mariner 50-60HP Factory Service Manual, Page 540Get this manual
TILLER HANDLE
10Rotate throttle grip to the wide open throttle positionThe throttle stop screw should be contacting the plateIf there is gap between the throttle stop screw and plate, loosen the jam nut on the shorter throttle cable, turn the adjustment nut clockwiseTighten the jam nut finger tight, rotate the throttle grip to full throttleKeep adjusting until the throttle stop screw lightly contacts the plate
NOTE: No free-play should exist in throttle grip handle once the throttle stop screw has hit the plateIf this condition exists, re-adjust jam nuts on appropriate throttle cableaThrottle Stop Screw Hitting PlateNo Free play should exist in throttle grip handle past full throttle once throttle stop screw has hit plateIf this condition exists re-adjust jam nutsIMPORTANT: After installation, cycle the throttle grip few times from the idle position to the wide-open-throttle positionMake sure the throttle stop is still contacting the plateIf it is not, re-adjust the jam nuts11Install lower cowl