1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Repair Manual P/N 520204, Page 87Get this manual
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Carburetor Mixture Adjustment20 1 Start the engine and run it in FORWARD at one-half throttleAllow the engine to reach normal operating temperature
2 Tiller ModelsAs you face the steering