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Watch Your Plugs!

It seems that most V Star owners just can't resist the temptation to make modifications to their rides. Often the first change is to more free-flowing intake and exhaust systems. Unfortunately, many of these mods are made without making corresponding changes to maintain a proper air/fuel mixture. Running too rich can cause plug fouling and poor fuel economy; too lean and your pipes can discolor and, in extreme cases, plugs and even pistons can burn. Either condition can cause sluggish performance. For the home machanic without sophisticated shop equipment, spark plugs can be an important diagnostic tool.

Yamaha recommends that you check your spark plugs every 4,000 miles and change them every 8,000. I would recommend that you check them after making any changes to your exhaust or intake systems. Remove the plugs as per instructions in your owner's manual, then check the condition and color of the plugs:

Your plugs should be a nice tan or light brown color. The electrode should not be pitted, and the ceramic insulator should be smooth and not cracked.

This plug is covered with a dry, black carbon coating. It indicates a rich fuel mixture, which could be caused by inaccurate jetting, excessive choking, or a dirty or obstructed air cleaner.

This plug is white or ash gray in color, indicating a very lean fuel mixture. Note that the center electrode is burned. This is caused by inaccurate jetting, over-advanced timing, engine overheating, or leaks in the air intake system.