Old Goat- Thanks! That "this screw here" and "that screw there" helps to understand alittle.
Now tonite, pulled the ol' lmt 56 off, re cleaned it. The little holes by the choke and all. If i saw a hole i stuck something into (no pun intended). Re-attached, new gaskets of course. Discounted my throttle cable so i can just slide the white plastic dohiggy with no other mod's hendering me. Start it, set idle to about 1300 sounds bout right. Hold it wide open hit 3300 smooth as can be. Now 3380 and up same surge happens. While holding the throttle wide open i adjust the "idle mixture" screw from the 1.5 i started at to about a total of 2.5 turns outs and it slightly smooths out, but stilll surges. Were talking if i could see the tach that quick about 80rpms. And this is at only 3570ish, Still 90 rpm's to go and it only gets worse. The only hindering i could see is that i'm gravity feed fuel and i'm down to bout 1/4 tank in an MTD fuel tank. Might not be the problem, trying to give you the whole scoop. Side note, i do have an old 1 peice carb from a 10hp briggs with an adjustable "high side screw" in the bowl. Should i try swaping this and seeing if maybe i just have a air/fuel problem? Any input would be awesome!! If i confuse you let me know.