 
It was time to change the plugs, although, it is kind of surprising how good the plugs looked after almost seven years. Gap the plugs before you start. We set the gap for .041 inches. Remove the three screws in the top cover, and blow out any dust in the hole with some compressed air.
After loosening the spark plug, reach in with a grabber or a piece of rubber hose to pull the plug out:
Here is the grabber we used:
Put some anti-sieze compound on the plug before you put it back in. Here are the two plugs side-by-side:
There is a noticable difference in the gap and condition of the old and new plugs:
Don't over-tighten. Keep your hand towards the center of the ratchet when tightening down, and follow up by a tug on the end of the handle with one finger. Unless you are really comfortable with torques, get a torque wrench to be sure. If you strip out the head, it will be really expensive.
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