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4-stroke OB's should have clean plugs. 2-strokes will have some unburned fuel/oil residue.
If the motor is running too cold (say if thermostat is stuck open), it will foul plugs prematurely.
There's a good Johnson/Evinrude forum on iBoats as well.
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Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA
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