atc350x jet part number??

[wolfspider]

hi i`m looking for atc350x pliot/slow jet 45 part number please, i`ve got a hard to start when cold 350x, i`m hoping this will make it easier to kick into life, it runs perfect when its started, no issues whatsoever, carb has been meticolously cleaned and i have a new plug in, also has great compression, only thing missing is the rear baffle, would this make it hard to start?
cheers steve