cb750f 77 runs rich

my cb750 which is all stock has developed a weee problem. I was riding the other night and decided to open the throttle all the way up for kicks, but when i did the engin kinda bogged down. So a few nights later i tried it again and noticed it was fine, but i had just started it up and had the choke on, so when i turned the choke off the bogging problem re-appeared. This seems to me like its getting too much air but if its not properly warmed up seems like thats would happen anyway. I checked the air filter and it seems fine no noticeable build up of dirt or dust really. I run non ethanol fuel with a little techron and marvels mystery oil. Any advice would be helpfull.
 
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