Unknown knob

by Dennis
(Vegas)

I have a 89 bass tracker with 25 Hp Johnson with electric start and right under the key to start the boat there's a knob that you can turn and I'm not sure what it does, I don't have owners manual and I don't really want to be turning it when the boat is running maybe it's some setting for engine I'm not sure any help would be great .

Thanks Dennis

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