push rods to valves fall out. model #204412
no gunk or buildup on guides or valve stems. am scratching my head.
Current Briggs&Stratton ohv engines have a known tendency for the valve lash adjustments to back off and become very loose over time. If you have one of these units you should adjust them at least once a season to correct clearance specification. Find specifications on line based on model number stamped on valve cover. If the push rod has fallen out you should remove it and inspect to ensure it has not become bent due to the abuse it suffered while operating with so much excessive clearance (another common failure).
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