Thanks Ty, that explains why you haven't just done a diagnostic swap of carburetors. I take it the carburetor is of an unknown brand? Otherwise you'd have quoted the type and we'd have been out looking for an overhaul manual for it. If it is a mystery carburetor, it takes a lot more familiarity with those little guys than I have, to work it out from first principles. There are several possible designs for most aspects of them.
