2007 Yamaha Apex Factory Service Manual, Page 540Get this manual

2007 Yamaha Apex Factory Service Manual, Page 540

SYNCHRONIZING THE THROTTLE BODIES INSP ADJ 7Adjust: throttle body synchronization aWith throttle body #1 as standard, adjust
time for less than second, and check the synchronization again If the air screw is removed, turn the screw 34 turn in and
be sure to synchronize the throttle body CAUTION: Do not use the throttle valve adjusting screws to adjust the throttle body