2009 Yamaha F40 Outboard Service Manual, Page 270Get this manual
Shimming Nut (shimming): Nm (0.2 kgfm, 1.5 ftlb) 12Install the special service tools g, h, and i, and then put another special service tool on the handle stopper to apply load14Turn the drive shaft 180 clockwise and measure the backlash againd