Yi is an amazing champion. However, I see the League tainted with builds that require you to get fed. This makes it so if you're not 11/3 or something, then you can't deliver a huge packing punch to tankies. I'm not saying those builds are bad, they just require you to be fed.
This build has NOTHING to do with having to be fed.
1. Health - Health means you don't have 2k HP, like the other builds. This build gives alot more HP through Frozen Mallet. I'll explain my choice on the Frozen Mallet later.
2. Attack Speed - Although your ultimate helps, your attack speed is still fast at late game.
3. Attack Damage - Combined with Wuju Style, your AD Bonus from your Atma's + HP, and the combonation of items, this build makes GREAT Attack Damage.

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Frozen Mallet - I chose the frozen mallet because its one of the only health items that gives bonus AD (Theres also Trinity Force, but that doesn't give much health.)
I also chose it because of its passive. Its passive slows enemies down with basic attacks.
This opens a new summoner spell in place of exhaust. Heal.
Heal - Heal can really turn around a fight. You know when you're running, and you KNOW if you had just a bit more health you could take the squishy Ashe thats chasing you? You heal, Alpha Strike their throat, then bam. Death for them. Of course, people will say, "Wow you're such a noob for using Heal."
They're just mad that you had superior tactics. Heal doesn't ruin the game. Sion does. They'll also probably say, "LOL RIGHT CLICK CHAMP."
Oh? Well, most AD Champions are considered "Right Click."
Does that mean everybody should play an AP Champion? No. It doesn't.

Thanks for looking at this guide, guys. I would appreciate it if you thumbs it up.