Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 37Get this manual
INSP ADJ
CONTROL SYSTEM
SYNCHRONIZING THE THROTTLE VALVES
1Inspect: Throttle valve synchronization Uneven opening Adjust
CONTROL SYSTEM
Inspecting steps (1) Remove the intake silencer 1(2) Disconnect the throttle lever rod 2(3) Turn the throttle stop screw until it does not touch the stopperNOTE: Record the number of turns so the throttle stop screw can be properly reset when the synchronizing has been achieved3060