12.5 HP B& S Carb IDK What The Heck Is Wrong :x

ok i got a 12.5 hp briggs its a flat head engine with the 2 pc carb i took it off cleaned it checked the smal rubber were needle valve go's thats good new bowl gasket and when i try starting it is like its flooding out? the bowl is plastic and non adjustable. so idk but its making me mad.

I have a older 11hp carb 1 pc can i use it on the 12.5? i know it will bolt on but im just not sure if it'll run right ?

yup

11 carb will work.

Any cracks or holes in the plastic float? Float needle look good?

needle looks new and good im going to switch carbs as i like the old style better lol but ill prob pull the float back out and do a submerge test in some gas to see if its got a hole or crack in it.

well got my other carb on and same thing kinda turns over pops off for a quick sec but wont start or stay running well did a compression test and 50-60 psi????
took the head off valves looked good little carbon but all right also looked a cyl walls and they look perfect not a score make in them at all. must be worn rings its a 91 i think. retightened head tried again and same. So i think im going to sell it and get another tractor