well Mr frankin Kitty G is now 16 weeks old and still biting.

I have been gently covering his mouth like suggested but he just instantly latches onagain.

What else can I do?

Are you saying anything when you cover his mouth?

I've heard some people use "BAH!" or "NO" or a low growl.

Have you tried distracting him with a toy each time he does it? Say no, then give him a toy that he is allowed to chew?

As he is only 16 weeks it may still take some time. Kitties will chew everything they can for a least the first year.

yes when I do it, I say firmly NO.

When does he bite? When playing or when he's being patted?
I really find some cats respond much better to a hiss or a tsst sound rather than no or bah, they work great for dogs but the mumma cat doesn't bark at her babies she gives a warning growl type sound (the one you hear when cats fight outside your window at 3am lol) or a hiss which I think cats understand better.
You could also try scruffing him when he bites, gently of course, use the hand he doesn't have his teeth in.
If he still comes back for more try ignoring him or put him in another room for a few minutes.
Good luck, they have such sharp little teeth you probably feel like a pin cushion.
Oh just another thing I remembered, don't be tempted to rub his belly if he's on his back, some cats like it but a lot don't & you might get claws & teeth.

Use one of those spray bottles filled with water and you squirt him when he bites.

Angela

Did you find anything that stopped your cat biting? Our kitty is 6 months old and she is still biting us. We have tried distracting her with toys, spraying her with water, holding her mouth closed for a minute, ignoring her, hissing at her, saying no sharply, shaking something loud like a canister of beans and none of this has worked! I try very hard to read her moods before I pat her but she is only friendly a few times a day:( I get sad holding other peoples cats because they are so nice compared to ours.

Sarah Jane is she desexed?

Angela

Harmony is 5 months and still bites occasionally. She is a bit of a psycho sometimes... I hate the kitten stage, I really do!

I find blowing quickly on her face and making a sound (hard to type!) which sounds like "Psssskaa!" makes her let go 90% of the time. She loves water so the spray bottle was a waste of time!