Update:
Carbs cleaned and reassembled using Keyster kit KH-1510, this includes #128 main jets and #40 slow jets. Beware this kit does not have proper size O-Rings for cross over tubes and they are no longer available from Honda! The original O-Rings were in good condition so no choice but to reuse them. Carburetors now reassembled and installed and synchronized with new Digi Sync Tool, the ST now running better than ever!
So now for the back story: 2018 Purchased 2002 ST with 25k miles, pulled carbs to install cruise control and replace all coolant hoses. Cleaned carbs and reassembled,
1st mistake the Pilot Screws were misadjusted to lean.
2nd mistake the choke valve cross over rod was out of adjustment allowing one bank to be leaner than other side when engaged on cold start.
The ST was hard to start cold but seemed ok once warmed up so I ignored the problem until it became worse and this year it began to run horrible, so off comes the carbs and now I have a new ST again, Yay!!