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View Full Version : 1999 merc 40 horse spark plugs

proguide
02-23-2009, 01:31 PM
what is the gap on the spark plug sapossed to be??

thank you
Boat Doc'
02-23-2009, 01:45 PM
.040
proguide
02-24-2009, 10:40 AM
thank you boat doc