2007 Johnson 2 HP 4-Stroke Service Manual, Page 136Get this manual
GEARCASE GEAR SHIMMING AND ADJUSTMENT
Forward GearPinion Gear
Backlash Adjustment
To check the gear backlash of the pinion and forward gear, hold the pinion gear by hand, then gently rock forward gear back and forth by handGear backlash: 0.004 to 0.008 in(0.10 to 0.20 mm) If backlash is larger than specified, the thickness of the forward gear backup shim must be increasedIf backlash is smaller, the thickness of the backup shim must be decreased
Push the propeller shaft inward and hold in position
Rotate the driveshaft clockwise five to six times