For one thing, I have never used pods on a bike with CV carbs. The re-jetting required to get these to run right is a nightmare.
But I am not trying to lecture you on what you should do or not.
One other problem area on the DOHCs are the inlet manifolds between cylinder head and carbs. They harden real bad and have air leaks, which could be the cause for the popping. Check whether all the clamps are tight.