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?