Carter BBS Slant 170cui idle problems

It could be getting too much fuel at hot idle [ too rich ] ...or too lean. Both can cause stalling.

Too rich.
- needle & seat not sealing or leaking.
- wrong float level
- float not 'floating'. Internal leak & it sinks.
- float binding on pivot or something else.

Too lean.
- blockage in idle cct such as accumulation of dirt/sludge