1/30/2024 0 Comments Spark inspectorMechanical damage to the firing end, as shown, is caused by some foreign object in the combustion chamber or the plug nose is too long for the engine (incorrect plug selection). This is often caused by overadvanced ignition timing, poor engine cooling, a very lean A/F mixture, a leaking intake manifold, or the use of a spark plug too hot for the application. Note the dead white or gray insulator nose which appears "blistered." Electrode gap wear rate will be considerably in excess of that normally expected. It may originate from glowing combustion chamber deposits, hot spots in the combustion chamber due to poor control of engine heat, cross-firing (electrical induction between spark plug wires), or the plug heat range is too high for the engine or its operating conditions. Usually one or a combination of several engine operating conditions are the prime causes of pre-ignition. This condition produces melting of the center electrode, and somewhat later, the ground electrode and insulator. Spark Plugs with Melted CDenter Electrode - Pre-Ignition Other less common causes include weak ignition system voltage or poor cylinder compression. Fuel injectors that malfunction can also lead to this condition. Often indicates bad ignition wires, an incorrect heat range spark plug or an over-rich air/fuel mixture caused by a clogged air cleaner filter element, or a faulty choke. Spark plugs demonstrating normal wear should still be changed at the manufacturers recommended intervals.īasically, soft, sooty carbon deposits on a spark plug, as shown, have a dry, black appearance. Operating in such a desirable environment results in deposits that will be light tan or gray in color with most grades of commercial gasoline. This spark plugs has been running at the correct temperature in a "healthy" engine. To clean the spark plugs simply remove all debris with a wire brush (or a fine piece of sand paper for hard to remove debris), rinse with gasoline or engine cleaner, check the plug gap (adjust if necessary) and re-install.Ĭheck the CycleFish Motorcycle Event Calendar!ġ000s of Local, Regional & National Events Listed! If the spark plugs exhibit extreme wear or any of the damage pictured below, the spark plugs should be replaced and the necessary repairs adjustments should be made to the motor. If the spark plugs exhibit normal wear as indicated in picture #1, you can simply clean and re-use the same spark plugs. The tips below can be used on all spark plugs whether they are motorcycle spark plugs, car spark plugs, boat spark plugs, or even your lawn mower spark plugs. In addition to replacing spark plugs at the manufacturer's recommended intervals, spark plugs should be removed, inspected and cleaned (if necessary) every 5,000 miles. Do you know what the types of wear or damage on your spark plugs mean!
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