Loosen the two screws holding on the carburetor with a T27 Torx bit turning it counter clockwise.

Remove the four screws holding on the old purge bulb by turning counter clockwise.

Remove plate holding on purge bulb.

The old purge bulb should come right out and replace it with the new. Be sure the rim of the new purge valve is properly seated when reinstalling

Reinstall the purge bulb plate and securely tighten the four screws. Be sure not to overtighten these screws as they can easily strip

Now reinstall the air filter housing, carburetor, and gasket in the same manner they were removed. Finally, reinstall the air filter and air housing cover.