You know...I've wondered the same thing. I have an old Toro lawn mower
that

biggest prob. will be to manage that little amount of fuel. i have built a
couple for harleys and the idle circuit is the one that requires the attention
to flow. but it is pretty easy one you get the basic principle down pat. volume
and pressure are the only things you need to control.
"try it-you'll like it"
jim