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Can anyone tell me what this black hose is??

Is your speedometer working? If not, it may have become disconnected or sensor is missing. Speed sensor
 
What size and model of Outboard Jets do you have? Maybe a power head drain or pilot (pisser) tube? Is it on a yamaha?
 
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@biffdotorg I think he means the black tubing coming from just above the joint where the jet and ob mount, by the motor mount. It points to the bottom of the picture. Cable is for reverse gate.
 
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