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I was watching some youtube vids on adjusting the valves on mower engines. I saw one guy that just rotated the engine until he saw the exhaust valve go fully open and then adjusted the intake and then did the reverse intake fully open and adjusted the exhaust. my manual for the motor says to...

i bought a craftsman 30cc 4 stroke trimmer today. Manual states that you must check rocker tolerance after 10 hours. I can't find the spec or procedure anywhere on net. its model 316731970 and from what I can see it's an MTD engine that is used in many trimmers. spec would be great -...