here is a picture with text for seemingly a simple task. It is not a simple task, it is all mechanical at all times. (and fuel injection is for malfunctioning kids)
I could not go all cold flow. I could not go all warm. I could not create a thunderstorm of clashing temps....I could not hook up the pcv inlet side to the plenum (very serious oem error). the orange line also has a serious function, it is a fuel system vent...it was also part of the very serious oe error..the engine PCV (little blue cone) sucked on the orange vent, which has ethanoled maine fuel and other repulsive eye watering things... right into the engine as oem setup. I later learned the giant steel plenum for such a little carb was a cheapskate hack job by subaru, as it was originally made for 2 carburators, and forced to function by engineers for one. (subaru secret for you) Too much on the orange line, the canister plunger gently hovering open to vacuum just right.....never does..too little, and the fuel system is choking like a tin can with a one way vacuum source (loss of power in other words- and fuel pump death , carb gasket death, and engine eventually...).
Believe it or not..everything in this photo is trial and error to a perfect function.
I won't be forgetting what I trialed and errored. In one barrel normal mode it is mid to high 30s, city or not it doesn't matter...I like the sporty bellow and can't help but having fun by stepping out a little bit once and awhile, this drops it to 30. the highway of course is the 3 main boxer mythologically making vtec hondas as feministically babbled as ever...90mph is 3600 rpm and absolutely loving it for eternity.and a honda wont ever have 10 gears and 3000 pounds on 1781cc. (I despise the inline four and have facts to disprove its horrifying success.)
anyway, I did see some metro carbed as a favorite, feel free to learn from this post. the smaller engine is very sensitive.