I recently aquired an 82 CB450SC I've come to realize it has some pretty serious bogging when you try open the throttle. its most noticable in first gear; hitting the gas actually slows the engine for a half second then once it is above 4k it takes off. It'll scream all the way to 9k from there.

There is little info on bikes this old out there and I'm a total newb when it comes to carbs. Does this sound like it could be the accelerator pump or do the carbs just need cleaned/rebuilt?