Don't pull the carb out unless you're going to change it. It's really tight and the throttle and choke plate are easily damaged. I bent the choke plate when I was pulling my old one out. It didn't matter to me because it's only good as a doorstop anyway. If I was just going to soak it I would have been screwed.
Here's a link to a YouTube video from Seafoam explaining the whys and hows. It's aimed at a Onan Marquis 5500. It's similar but not identical;
Here are detailed instructions for the QG 4000:
Google and YouTube are your friend.
Good Luck
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