hi, i'm having a little problem getting the settings right on my carb. i'm running bike in at the moment, so havent opened it up fully yet, taking it up to 50mph tops. runs fine when going through 3rd and 4th. but at low revs i have a lot of spitback from carb, and bike feels spluttery. its a standard sil 200, sterling pipe, and 26mm dellorto.
main jet 105, pilot 55, atomiser av264, needle 2nd top.
should i change the pilot to 50. or adjust needle, up or down???

thanks for looking.