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Starting from top cylinder to bottom (left to right) these are the spark plugs I ran at break in approx 3.5 hrs is this normal for top to be more black then bottom?? Thanks for the help
Starting from top cylinder to bottom (left to right) these are the spark plugs I ran at break in approx 3.5 hrs is this normal for top to be more black then bottom?? Thanks for the help
What does break in refer to? Is this a new engine or did you just rebuild it?
In general, the rings on #1 will begin to plateau the cylinders and seal first. This is mainly due to heat. #3 will often run colder and wet at idle but will come around after about 10 hours or when your finally running at 50:1 mix.
