10-11-2022, 07:35 PM
I have a simple way to find No1 firing position without the use of an assistant. Take out all spark plugs except No1. Crank over the engine with the crank handle until you feel compression developing. That will be No1 cylinder. Take out No1 spark plug and insert a screwdriver to feel the top of the piston. Continue turning the crank until the screwdriver stops rising. That will be No1 tdc. If you inadvertently go past tdc, continue cranking slowly for two more revolutions until you reach No1 firing tdc again.