I HAVE A FIAT 850 1971 SOPRT, SPIDER.  IT WONT IDLE.   I TRIED TO
CLEAN OUT THE JET, BY REMOVING THE NIDEL AND SPRANING CLEANER IN IT
AND THE JET ALSO, NO GOOD.  IT WILL IDEL WITH THE CHOCK LEFT ON 2/3 OF
THE WAY.   CAN I CLEAN THE CARB BY JUST REMOVING THE TOP PART AND HOW
DO I DO IT?   I KNOW SOME MACANICS BUT, WELL, CAN USE SOME HELP.   IT
IDELS WITH THE CHOCK ON.  AND I GUSS THE IDLE JET OR SCREW IS CLOCKED,
RIGHT?   HELP!

Did this just start happening?
Usually if a motor won't idle, it means there is an air leak somewhere
below the throttle butterfly, like were the vacuum advance line is.
Check all of your vacuum lines. These can look good, but with age they
loose their grip on where they're attached. Sometimes the carb becomes
loose where mounted to the intake manifold, or where the intake
manifold connects to the head. I had this happen with a 1969 Datsun.
I'd been driving some bumpey logging roads. The nuts loosened which
held the intake manifold to the head; the manifold was moving enough
to wear down the gasket there and air leaked in.

My first thought is a faulty float, though the common problem with a
float is to be soogy with gas and sink which brings in too much fuel.
Your problem is a fuel starvation one.

A carb cleaning is reasonably cheap and a replacement carb from a
junkyard is as well. Rebuilding it is a bit more expensive and not for
the faint of heart. Better to get a spare carb at the salvage yard and
practice a rebuild on that.