Mercury 25 EFI Service Manual page 165

6. Remove the lower throttle rod from the throttle barrel and the throttle arm.
7. Push the throttle arm towards the front of the engine. Ensure the throttle arm is contacting the WOT stop on the cowl.
a
8. Push the throttle cam to the WOT stop.
9. Adjust the upper throttle rod so it will snap onto the throttle cam when the throttle cam is at WOT.
10. While holding the throttle arm against the WOT stop on the cowl, push on the throttle cam to the WOT position. The throttle
cam should not have any movement.
11. If the throttle cam can be moved, remove the throttle rod from the throttle cam and extend the throttle rod one complete
turn.
12. Check to ensure the throttle cam does not move when the throttle arm is against the WOT stop.
a
b
13. Ensure the lower throttle rod is fully threaded onto the joint. Do not tighten the jam nut.
90-8M0105568 eng MARCH 2016
a
a -
b -
b
21253
© 2016 Mercury Marine
Timing, Synchronizing and Adjustments
a - Upper throttle rod
b - Lower throttle rod
b
21250
Throttle arm contacting WOT stop
WOT stop
a -
b -
21274
Throttle cam
Upper throttle rod
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