I have a 1972 Honda CB750 that I have been working on and have a question about running the engine with the choke off. I originally posted this question (1972 Honda CB750 Motorcycle Choke) and it solved some of my problems but now that the bike is running I'm having an issue where it never runs with the choke fully off. Here's what I've found:
• With the choke on, the bike starts up great. No problems there.
• With the choke off, I can't get it started.
• After the bike heats up a bit, I can start it and run it with the choke about halfway in and it runs fine and I'm able to ride it around indefinitely with no issue.
• Even after having it run and riding it for 30-45 minutes, if I push the choke all the way in (turning it off), the bike will run but it doesn't seem to be inputting any gas to the engine. If I rev the engine, the bike doesn't speed up and it just gradually begins to die until the bike is just rolling and not on (it shuts off). I try to give it gas and nothing really happens that I can tell.
I don't know if this has to do with the carburetors but I would guess it maybe doesn't since the bike is running fine with the choke halfway on. I will say that with the choke halfway on, it seems to feel a lot 'heavier' than with the choke all the way on (probably not the right term but it just tends to feel a bit rougher and louder with the choke halfway on as opposed to the choke all the way on).
Basically, I'm trying to figure out why the bike doesn't run ever with the choke off no matter how heated up it is.
Any ideas on where I can begin to look? Thanks!