The main goal of racking is to get it off the lees (the thick layer of yeasty stuff on the bottom). When I rack my cider, I try to not aerate it anymore than I have to, and then let it sit again in secondary for a week or so and then bottle. While racking won't stop the yeast, it will help keep any off flavors from the lees from settling in to your cider. It's especially important if you're planning on letting it age/condition/clarify for long periods of time.
If you have a hydrometer, I'd check it before you do anything. Give it a taste test as well. It really all depends on what you're trying to make, how you want it to taste and what your plans are for finishing it.
Cheers!