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Speedo for a 80hp yamaha outboard

Where is the take off point for a speedo on a 10 year old 80hp 2 stroke yamaha outboard engine.
i am trying to decide if the speedo fitted on my boat is okay or if its the sender unit faulty.
i can get the dial to move on the gauge but it takes a bike pump to do it is this the sort of pressure needed.

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The sender is a plastic flip up fitting located at the bottom of the transom. They have two positions. Down and in the steam below the bottom of the water for reading the speed. Up to protect when trailering. Check to see if it is up. I never heard of a unit that is attached to the engine itself.

Posted on May 12, 2009

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There is not a sending unit for this, remove the rubber hose from the back of the speedo and blow back through the hose and out at the motor lower unit. Most engines have a small hole in the front of the lower unit for the water to pass through, it is probably plugged with sand or wood

Posted on Jan 19, 2009

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