I forgot the most important upgrade!
Dump that skinny tube muffler, install a change direction baffle muffler, such as a Stanley FO-2.
I do this one to all my Dextas and Super Dextas.
I make mine with a FO-2 muffler, adapter and flap from Agri-Supply, Tractor Supply, etc.
The difference in sound quality is significant, and absolutely no difference in power.