Heat the oven to 325 F. Spread the pecans over a baking sheet, and bake for 12 to 15 minutes until lightly toasted.
Combine the pecans and the bourbon, then cover the container with plastic wrap, and let the mixture sit for 2 to 3 hours. Drain the pecans, but reserve the bourbon.
Combine the pecans with the graham cracker crumbs, ¼ cup cocoa powder, and ¼ cup confectioners' sugar. Stir the bourbon, corn syrup, and maple syrup into the nut and crumb mixture.
Roll the dough into balls approximately ¾-inch in diameter. Combine the remaining cocoa powder and confectioners' sugar, and roll each bourbon ball in this mixture. Optionally roll the bourbon balls in granulated sugar.
Cover and chill the bourbon balls for at least 20 minutes before eating them. The bourbon balls should stay fresh in the refrigerator for 2 weeks.