Are you looking for the marinade itself, or just the instructions for injecting?
Here's a great marinade that's easy to make:
- 2 heads of garlic
- 1 cup orange juice
- 1/2 cup spicy mustard
- 4 tablespoons honey
- 2 tablespoons olive oil
- 1 teaspoon thyme
Cut off the top of the garlic bulb so that the tops of the cloves are exposed. Pour one tablespoon of olive oil over the top. Place on preheated grill and roast over a low heat for about 30 to 45 minutes (or until the cloves are soft). Remove from grill and allow to cool.
Squeeze the cloves of garlic out of the bulb into a blender. Add remaining ingredients and blend until smooth.
THEN, you'll need an injector tool. You can get them for under $10 at any kitchen gadget store----probably even Wal-Mart or Target.
What you want to do is get it into the main morsels---the breasts, thighs, and drumsticks (there's really not enough substance to the wings to merit wasting time or effort). Try to avoid tearing the skin as much as possible, as it's like your natural "foil" meant to keep all that flavor in during the cooking process. Basically, just jam the needle in, and slowly "inject" as you withdraw it, so as to spread the marinade. Also be sure to put marinade between the skin and the outer layer of meat. Don't bother putting it on the outside of the skin---it will all cook off.
Also, don't cook it right away! Wrap the bird up, and put it in the fridge for at LEAST 8 hours to let the marinade soak into the meat.
Good luck!