Z1OwnersClub GB

I recently had my z1000 serviced with the carbs being balanced and the shims all checked and made right but I still get spit-back occurring. I asked my mechanic why and he said that it's probably worse when the engines cold, which it is and that with a standard air-box it probably wouldn't occur? As these aren't easily attainable, I'll stick with my pods. However today, in the rather hot & humid conditions, the bike didn't do it at all but the other evening, while coming back from Loomies and when the air temps had dropped, it was spitting-back like a mother fucker in the cooler, damp air. So, my question is; does the extra, cooler air flooding the carbs contribute to this symptom while it wouldn't be as bad when air temps are extra warm?

Dont know if relevent but i fitted the the snorkel part of the air box as I finaly managed to get hold one off eBay.
Started first press and on all 4 cylinders
Had to adjusted tickover and now seems to run better.

If its got individual filters you may need to up-jet it a little. One size up on the pilots will likely cure what is a fine balance between lean running when cold and the co-responding over-richness that the choke provides temporary relief from.
AL