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Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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[QUOTE="Rich Rohrich, post: 121750, member: 16241"] Four stroke plugs should be white on the insulator with a texture similar to a new plug and no obvious signs of overheating on the center electrode or ground strap. There should be a small (approx 1/8") ring of carbon extending from the point where the insulator and the metal body meet at the base of the insulator. You'll only be able to read the plug this way if you start with a fresh plug and a full load WOT run . If the insulator is black with the engine running good it's just a sign that at some point you experienced too much fuel and not enough heat/load. Not an uncommon situation when using an accelerator pump equipped carb. Reading four stroke plugs is the same as reading two-stroke plugs except for a lack of insulator coloring from oil in the mix. If you are comfortable with reading two-stroke plugs then all you have to do is lose the notion that a white insulator tip is a BAD thing :) If it runs good chances are good it's jetted right. Response is still the best indicator. Good luck. [/QUOTE]
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Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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