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set the cylinder to tdc on valve overlap. remove the valve cover. you may leak a small amount of oil so have a container to catch it or a rag to wipe it up. loosen the outer nut, turn the inner screw in or out to the valve lash setting as checked with a feeler gauge. while holding the inner screw from moving, tighten the outer nut and recheck the setting. after it is set, turn the motor over a few times by hand if possible and check the setting again

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Q: How do you adjust the valves on a 20hp briggs and stratton lawn mower?
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