2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 124Get this manual
Power unit
Installing the sprockets and timing belt
1Install the driven sprockets 1, and then tighten the bolts to the specified torque2Check that "I" marks and on the driven sprockets are aligned with marks and dAlign if necessary3Install the new gaskets, cylinder head cover 2, and then tighten the bolts to the specified torques in two stages
Drive sprocket bolt: Nm (0.7 kgfm, 5.1 ftlb) Timing belt tensioner bolt: 39 Nm (3.9 kgfm, 28 ftlb)