Most people don't realize this, but if your machine is not running at it's peak, quite possibly the best diagnosis tool available you already have. Your spark plug!
Learning how to read your spark plug can tell you a ton of information about whats wrong with your machine and quite possibly what to do and how to get your machine running at it's best.
The attached images are excellent guides to learning how to read spark plugs.
If you want to print these and get good quality, I would save them to a thumb drive and take them somewhere and print a photo quality image on photo paper, unless you have a printer that will print to photo paper. I have an HP 9800 and can print up to 17" photos. I wouldn't recommend printing to regular paper if you are looking for best quality.
The images in the original post are quite large, and will print very nicely to photo paper, even full page images.
Great stickie! Having problem setting idle and cold starting. Plug is sooty and X24ES-U. Manual sez should be resistor plug X24ESR-U. Think this is the problem? Thots?
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