2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 12Get this manual
GEN INFO
General information
Crankcase The crankcase is made of cast aluminum, however steel has been cast into the areas for the crankshaft bearingsBy distinguishing the area that requires strength from the area that allows the use of lighter material, both weight reduction and stronger construction have been achievedThe caps for the crankshaft bearings are secured with four bolts to ensure high level of assembled rigidity