A general rule of thumb is 10-15% of the snake's body weight per meal. For 86 grams (this honestly seems a bit small to me, if you've had him a couple months) his meals should be in the 8 - 12 gram range. This would be a small rat fuzzy or a mouse hopper. How often are you feeding?

Seriously though, post pictures of the little guy. The one in your original post isn't showing up.