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Same thing happened to me on my 2007 170 CC. The boats are coming from the factory with the tach rigged for a 4-stroke and not a 2-stroke. The setting on the back needs to be set from position 5 to position 2. The change takes about 10 minutes. Use a small screwdriver and push the pin in and turn it to the new number gently. It should be fine going forward. Good Luck!!!
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