1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 265Get this manual
THROTTLESHIFT LINKAGE (TILLER HANDLE SHIFT MODELS)
7Adjust shift link rod to length of 13.0 cm (5-18 in as measured between ball joint centerlines8Connect shift link rod between joints of gear shift lever and shift shaft lever
aShift link rod [Adjust to length of 13.0 cm (5-18 in]Shift shaft leverGear shift lever
9Adjust throttle link rod to length of 12.4 cm (4-78 in as measured between ball joint centerlines10Connect throttle link rod between ball joints of primary throttle lever and throttle cam11Connect control cables to pulley of secondary gears and anchor bracket as outlined in Section 7C