72 CB350 fuel delivery/carb problem

[section8joe]

I have this 72 CB 350 that I bought at the beginning of summer. Compression on both cylinders is around 170. Points are set properly. I’m having some type of fuel delivery/carburetor issue. I put on brand new petcock, new in-line fuel filters and cleaned the carbs. When I turn the fuel on I only get a trickle in one of the fuel filters coming from the dual lines in the petcock. I was under the assumption that the carbs create a vacuum and will pull fuel into the float bowls but I think I'm wrong. When I ride the bike I hear a very weird sputter that comes from the left side. It’s almost like a sucking sound coming from the left pod. After the bike has been running for a while the idle hangs when I blip the throttle and I’m assuming it’s not getting enough fuel. What are my options here? What do I need to do to fix this?

[TriNortchopz]

got original CV carbs? If so, are the diaphragms in good condition?
Did it do this before you "put on brand new petcock, new in-line fuel filters and cleaned the carbs"? what type of petcock - with vacuum connection?
float height set right? gas tank clean - debris not causing fuel flow issue?
possible air leak at manifold?
Electrical system all good with fully charged battery?

maybe something here:
TECH INFO & HOW-TO GUIDES
CB / CL 350

https://www.common-motor.com/CB350-CL350-SL350_bc_1.html

[JanKK]

It´s a common problem. Mostly a mix of petcock and carb problems. My solution is XL125 petcock (single port with y-tube) and VM30s. This works.

[docmel]

It´s a common problem. Mostly a mix of petcock and carb problems. My solution is XL125 petcock (single port with y-tube) and VM30s. This works.

My money is on the in line filter, new or not (I have found they are VERY restrictive, new or not) , and a crappy/filthy petcock that needs to be replaced

[section8joe]

I haven't had much garage time this week but I was able to pull off the carb and clean everything again. I double checked the float heights too. I put everything back on and semi synced up the carbs and the bike seems to idle way better, although the idle does seem to hang just a little. I still get a little sucking from the Pod but I haven't tried messing with the mixture screws. Later this week my friend is giving me side covers and the stock air boxes from an old CB. Once I pop those on I'll try to do and mess with the mixture screw.
One other thing, I tried to sync the carbs turning out the throttle cable barrel adjusted until the idle set screw starts to move but I can only do that on one side. The other side doesn't want to work that way so I've been adjusting both sides until the both actuate at the same time.

[section8joe]

Today I had a chance to play around with the idle mixture screws and the right side seems to be running smoothly but I can't get the right side to run on one cylinder. It will run with the throttle wide open but it's kinda rough. I also tried to run it on choke to see if it ran better or worse. It ran the same with the choke on and off. Im thinking a can rule out carb issues and maybe look as spark/ignition coin. Whats my next step? Im thinking I should try to run the right side wire on the left to see if it runs better.