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    how to adjust idle on Johnson 9.9 1987

    I have a 1987 Johnson 9.9 seahorse, It starts well but, I would like to know how to set the idle. There is a round knob next to the choke which I can turn 360 is this the mixture adjustment? Also there is a round black knob on the side of the engine case just above the fuel pipe connection, it...
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    johnson 9.9 seahorse what year ?

    Can anyone help me find out the year of my Johnson outboad? there are two numbers on the id plate- E35 bacsm and B010442 Also there is a round black plastic knob that comes at of the engine case just above where you connect the fuel supply, any ideas what it's for?
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