Can't start brisggs & Stratton 21in mower. I

Try squirting a little gas into the carb and crank it. If it starts and dies, your carb need to be cleaned/repaired.

Get some GUMOUT carburator cleaner GAS ADDITIVE. Put about 1/2 TEASPOON in the gas tank and about 1 tablespoon per gallon into your spare gas. The float pin is probably sticking from winter non-use. This will free it ip.

You can also remove the bowl from the carburator and spray everything to immediately dissolve the varnish. Be careful not to lose the pin spring.