yes, slight modification needed.
If you mean a 32% step up from the motor , it would 909.09 RPM
it will not fit but they do sell counter rotator props so if your in forward gear and the motor goes reverse, you have the counter rotating prop
$1000
In neutral, the propeller shaft is not engaged with any other part of the motor so the prop will spin freely. You'll often see this when a boat is being towed down the highway - the prop is spinning the same as a windmill does in the wind. It's best to let it spin cause if you put the motor in gear and the prop hits something, such as your driveway while you're going in or out of your yard, there is no give and you could damage your prop or worse, the gears inside.
Replace the shear pin.
Sometimes the center of the prop breaks loose and slips or the splines get stripped. Also check to make sure you have the correct pitch prop for that motor and it is fastened securely.
398lbs +prop and oil,gear lube 446lbs
This depends on what kind of prop is used and how much slip in the water it has.
For a 1985 Evinrude 9.8 HP outboard motor, the prop nut torque specification is typically around 25-30 foot-pounds. It's essential to ensure the propeller is securely fastened without over-tightening, which can damage the prop or the motor. Always refer to the owner's manual for the most accurate specifications.
There are to many variables that go into that question . Boat weight , motor size , prop pitch and diameter , form of the boats hull ( flat or a v hull ).
A 4 hp Mercury outboard, produces a true 4 hp, rated at the prop.
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