Can only put throttle to 80% when lowered

Sandhead

Recruit
Joined
Aug 4, 2007
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3
2003 Mercury 2 stroke 15 hp outboard. Brand new to me. I know it's recently had the water pump replaced.

The problem i'm having is i can't set the throttle to 100% while the outboard is in the number 1 position. I have to raise it to three reset the throttle, then lower the engine back to 1 and then I can giver. Sometimes i have to raise the engine two or three times. Anyone have any idea what the problem could be?
 
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