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1971 evinrude 18 hp.

Discussion Forum at MarineEngine.com » Johnson Evinrude Outboard » Archive through May 21, 2008 » 1971 evinrude 18 hp. « Previous Next »

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busterw4
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Posted on Monday, May 19, 2008 - 07:02 am:   Edit Post Delete Post View Post/Check IP

i was wandering could somebody please tell the fuel mixture ,i was mixing 50 to 1 but smoked alot and fould the lower plug,and need to know how to set the fuel mixture setting, and the gap on the plugs.1971 einrude 18 hp
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ikia
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Posted on Monday, May 19, 2008 - 09:30 am:   Edit Post Delete Post View Post/Check IP

50:1 is the mix and it has nothing to do with the fouling plug.Check to see if you have a spark that will jump a spark across a gap of 1/4" or better on both cylinders. The fouling is caused by a weak spark.Also make sure the thermostat is in place and working.
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jwbmarine
Senior Member
Username: jwbmarine

Post Number: 1566
Registered: 11-2005
Posted on Monday, May 19, 2008 - 09:32 am:   Edit Post Delete Post View Post/Check IP

50/1 is correct....use champion j6c plugs--.030
w/eng idling,...turn low speed mixture screw in till it coughs,then back out 1/4 turn,..usually gets in just right.due to wear,and condition of needle/seat area,..u can always 'fine tune' .

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