A clogged main jet will only prevent top end power.
You said It started at one rate and now only idles.....? Your bike is fuel starved.
Check the petcock vacuum source. Either you developed a leak in the petcock diaphram or the vacuum line has a leak in it.
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012