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If you ever plan on changing a magneto, please check for proper gap first.

Hi all I have a Tecumseh tvs120 63911h 5 HP L-head engine on a Sears 917.372480 self-propelled mower. I can start it, but my wife has a hard time with the pull starter. I thought about adjusting the valves. Does anyone know if the valves are adjustable? I am unable to tell from the parts...