Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 397Get this manual
LOWER UNIT
6Align dial gauge pointer at 90 to the mark on the backlash indicator tool and read backlash on dial gauge by lightly moving driveshaft clockwise and counterclockwise by handGear backlash: Approx0.3 0.5 mm (0.012 0.020 in)
If the backlash measured is larger than the specification, add the amount over the specification to the temporary use forward gear back-up shim and install this shim If the backlash measured is smaller than the specification, subtract the amount less than the specification from the temporary use forward gear back-up shim and install this shimChecking and adjusting tooth contact pattern (Pinion and Forward gear) Check tooth contact pattern using the following procedure: 1To assess tooth contact, apply light coat of Prussian Blue on the convex surface of forward gearNOTE: While assessing tooth contact, remove the special tool, gear adjust spring set (09951-09310)2Install forward gear and propeller shaft housing assembly into gearcase, then tighten both bearing housing retaining bolts to specified torque3Using driveshaft holder tool, rotate the driveshaft times" 09921-29410Driveshaft holder 4Carefully pull out propeller shaft and housing to check tooth contact pattern