2000 Yamaha 80hp 4 stroke low RPM's

ranger617

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Joined
Jun 26, 2013
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I have a 2000 4 stroke carb 80hp Yamaha on a Ranger 617t. Has not been run for the last 4 years. The motor runs great on the muffs in neutral, forward and reverse. I put the boat in the water it will run great in neutral and reverse. In forward I can only go 8MPH AT 2500RPM. Any ideas??
 
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