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Yamaha f9.9sk 4 stroke not winding out all the way

I have a 1985 short shaft tiller handle yamaha f9.9sk on a 16 foot lowe v bottom boat and i can only get it up to 9mph. It runs about the same speed at 3/4 throttle and full throttle but at full throttle it tries to cut out like it isn't burning the fuel fast enough and you can hear the rpms not getting up to where they should. Any help on what the problem is would be great!!
 
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