This is usually caused by something contaminating the bearings or blocking the cooling blades against the housing cover. If the engine is started by a pull cord and that pull cord won’t budge, then the magneto is frozen. If either of these is the case, you will need to purchase a repair manual for the particular engine that powers your concrete mixer for the detailed step-by-step instructions for magneto troubleshooting and replacement. If you see no spark, then the magneto is either bad or needs replacement. Hold the handle of the screwdriver with the screwdriver blade very close, but not touching, a metal piece of the engine and pull the cord or turn the key. If the spark plug isn’t the problem, insert a #2 Phillips screwdriver into the spark plug boot until it makes contact with the electrode inside. To determine if a fouled spark plug is the culprit, use a (usually)13/16 socket and a ratchet to remove to spark plug and verify that there is a gap between the center electrode and the plug body.
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