CARB VENT LINES

I pulled them out of the space between the clip and bowl and zip tied them along side, still ending in the drip tray.  Pressure at the drip tray on the RV 12...who knows?  Things that resolve it:  5280-5300 rpm instead of 5400=5450, and the choke.  The carbs just had their 200 hr inspection by a real shop.  

Hmm... did you ever have this problem before the 200h inspection?

Don't have and airbox, but I took the tubes out of the wire hold down wire, zip tied them to the wire and put them into the drip pan.

Hi cousin Steve!  Was it doing this prior to relocating the vent lines? If not, could you try returning them to their prior configuration?