2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 114Get this manual
Power unit
NOTE: Apply force to the crankshaft end until the flywheel magnet comes off the tapered portion of the crankshaftFlywheel magnet holder 6: YB-06139 Universal puller 7: YB-06117 12Remove the wiring harness guide bolts
10Turn the flywheel magnet an additional 120 clockwise and align the "1TDC" mark on the flywheel magnet with the pointer, and check that the "I" marks on the driven sprockets are aligned with the alignment marks on the cylinder head11Remove the flywheel magnet
NOTE: Move the wiring harness guide to position that will make servicing easy13Using hexagon wrench, turn the timing belt tensioner clockwise to push the timing belt, increase strength gradually, and then insert 5.0 mm (0.2 in) pin into the hole kNOTE: Leave the pin inserted into the timing belt tensioner until the timing belt has been installed