throw away the mower and buy something with a honda engine
Quite possibly the keyway under the flywheel has gotten sheared. This will allow the flywheel to move slightly causing the timing to be off. Remove the flywheel and install a new keyway and realign the slot and reinstall the flywheel. And like the previous answer, slide a business card between the flywheel and the coil to set the proper distance.
check the flywheel
take a business card and unscrew the bolts holding the coil near the fly wheel and slide card between coil and flywheel then retighten the 2 screws and that is how you get the timing
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can i adjust the timing on a briggs and stratton engine ?
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