Here are 2 pics of my plugs on my '04 SM. left plug is from the left side and right plug from the right. I have 2,000 miles on it. I get a loud backfire (sounds like a gun shot) every once in a great while from the left side exhaust pipe. I have bubs slash cuts on - 130 mains - 42 pilots at 3 1/2 turns - stock air box. I'm no pro at judging spark plugs and i did look at the chart to see if they are looking good but all the pictures look basically the same to me. They're obviously different colors so i'm guessing a carb bablance is in order? Possibly air/fuel adjustment? Opinions appreciated. Thanks all.
-Josh
