74’ cb360 running on one cylinder, 150 on left 0 on right

I would say, 1 of three things is the issue, since it's only one cylinder without compression..1.. there's a hole in said cylinder piston, or large groove in cylinder wall from some type of debris..2.. One of the valves in said cylinder is compromised. 3.. one or both cam lobes are wiped..for that cylinder..just my opinion..but I could be wrong..