What can I do to stop my 4 yr. old pony from biting me?

No offense but he is biting you cause he has no respect for you. My horse bit me when I first got him but doesnt do it anymore due to long periods on the lunge line. When he does try to bite you, you have to be quick, quicker than him and as soon as he tries, or preferably before he tries smack him on the nose. Dont punch him... Pop him. He should learn that that is a ""No, no" Also, dont give him any treats out of your hand as this is very bad to encourage biting... If he tries to sniff your hand for treats, next time you go out in the pasture put a nail in your hand, between your fingers with the pointy part facing up, he wont like the prick it gives him and he wont try to do that. Also, I see he cribs? You can get spray that tastes bad to stop the chewing but... Anyway, its not a phase and if you let him bite you and crib and fling his head when muzzled then he will just do this more often, And it will get worse. You need to spend ground time, which a lot of riders neglect to do so, lunge him a build trust between you and him. No temporary fix works, You need to not let him bite you, he will just do this more and more and he will do it harder and harder and if you let him get away with it then... its going ti be disastrous. One more time, its NOT a phase and a temporary fix, well really, you want to fix it for a while then let him do it again? NO temporary fixes and its NOT a phase. Spends ground time, more than Saddle time and build a trusting bond between you two (: Please, dont take anything I said to harsh, not trying to be rude but just trying to... help xD