2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 91Get this manual
Throttle control Synchronizing the throttle valve
1Loosen the bank synchronizing screw 12Remove the port link rod and starboard link rod 3
6Loosen the port throttle stop screw until it separates from the throttle body lever 9
3Loosen the starboard throttle stop screw until it separates from the throttle body lever 57Loosen the synchronizing screw of cylinder #4 to open throttle valve #48Loosen the synchronizing screw of cylinder #6 to open throttle valve #6