2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 413Get this manual
LOWER UNIT
4Carefully pull out propeller shaft and housing to check tooth contact pattern
Concave side Tooth width Convex side Heel Toe Tooth top Tooth bottom TOOTH CONTACT PATTERN
Optimum tooth contact The optimum tooth contact is shown at rightA shim adjustment may be necessary to obtain this contact pattern# Gear backlash should be checked when increasing or decreasing shim thickness to adjust tooth contact
Optimum tooth contact approx13 of tooth width approx1 mm HEEL
TOE Convex side