Have a read through the tuning and workshop sections of the site, it contains loads of usefull information like this:

"Remove the spark plugs, and check the colour of their respective electrodes, noting which cylinder each plug came from. They should be a light tan colour if your settings are good. Too dark, or black, and it's rich, if the plugs are grey you are too lean, and if they are near white, you are dangerously lean!!"
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