Hard starting 650 seca

I have been working on 82 650 seca clean carbs ,new plugs,fresh fuel,lines and filterchange oil and filter,fork seals,new rear tire,rear brake light switch general cleaning and detail as I go ,but bike is very hard to get going seemed fine the first day Icleaned carbs but after setting a couple days I had to use starting fluid to get going but seems to run good once I get going, but is a little slow to return to idle, seems like number 1 isnt hitting on ign.,the other three pipes are warm to the touch after a few unsuccessful attempts
but 1 is still cold all are firing good all have around 150 psi comp,carb holders and airbox boots are very good this bike only has 4200 miles I know its close but not there yet I guess I missed something in the carbs choke or what,I had it all apart spray carb cleaner thru every passage followed up with compressed air what did I miss???

 

did you polish the slide bores?
did you bench sync before putting the carbs back on? what do you plugs look like when you idle it after it starts?

 

Bench sync,yes,polished slides,yes,134 tan color 2 more gray

 

how does it idle once you start it?