How to Diagnose Small Engine Problems
Whether it powers your lawn mower or chain saw, a small engine can--and does--develop irritating problems. It may be hard to start or may die easily--or it can act up in other ways, such as knocking or overheating. To cut down on frustration, learn how to diagnose common problems so you can fix them and, better yet, prevent them in the future. Does this Spark an idea?
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Instructions
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Check the fuel delivery if your engine won't start. See whether there's fresh fuel in the tank, examine the fuel tank cap for clogging and make sure the shutoff valve isn't closed.
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Look for carburetor problems next. The carburetor may be blocked, choked too high or poorly adjusted.
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Turn your attention to the ignition if the engine still has trouble starting. The spark plug may be dirty, the plug gap may not be correct, the wiring may be damaged or the switch may not be functioning.
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Check for poor compression--it's another common culprit when an engine doesn't start. Parts such as valves and pistons may be damaged or dirty.
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Learn the probable causes of a knocking sound. Common ones include a loose flywheel, bad spark plug, worn cylinder and carbon that has built up and needs to be cleaned out of the combustion chamber.
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Check the areas that often cause overheating. Clean your engine, make sure the oil level is sufficient and check the fuel mixture in your carburetor--it may be too lean.
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Tips & Warnings
Always work on small engines in well-ventilated areas.
