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    Motor running at half speed or less at full throttle

    Have a '95 Mercury 40hp Powertrim oil injected motor that runs fine for 5-10 minutes, then drops to half speed or less at full throttle. Motor not used since 98. Replaced fuel, fuel filter, added Seafoam to tank and cleaned carbs. Still have same problem. Any ideas of what to do next?
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    Need help with '95 40 HP Mercury motor

    My dad is looking at a '95 Mercury motor, Power Trim, 40 HP, oil injected. Runs/idles fine for 5-10 minutes, then when in full throttle, runs half speed or less. Motor hasn't been used since '98, and even then was used very little. Fuel/fuel filter were replaced, Seafoam added to tank, carbs...
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    Need help with 95 Merc motor

    My dad is looking at purchasing a 95 40 HP Merc Motor, Power Trim, oil-injected. Motor runs/idles fine for 5-10 minutes, then at full throttle, runs at half speed or less. It hasn't been used since 95, but even then was used very little. The gas, fuel filter has been replaced. Seafoam was...
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