Yes. If you can relocate to the Bay area for 3 months, get a visa for the time you'll be there, and also move your startup.

It's easier if you 1. try to get your visa as soon as possible (now), 2. haven't incorporated yet, 3. can move most, if not all cofounders to California.

EDIT: I'd like to add I'm not formally associated with Y-Combinator. Just trying to help.