This build is a build i often use sucsessfully. The order of it is essential for early farming and late game carrying. I'm not gonna go into heavy detail about how you should play Yi with this build since everyone has their own playing style. Instead I'll do my best to explain how i think he should be played.

I personally use a full crit chance page but i used dodge seals and armor pen quints in this build for variety. With a full crit chance page though, you will get 90 percent crit chance at full build. Attack speed runes work well also.

An excellent summoner spell as you can disable your enemy and two-hit him to death.
A great spell for Yi. It will probably save your life if used correctly.
Goes very well with yi. You will be able to chase down any enemy champion with it.
Goes extremely well on Yi as you can flash away or into team fights.
I'd rather go with Exhaust since you do more damage with your basic attacks than Ignite.
A very underrated spell. It will save you alot of times if used correctly.
Should only go on jungle yi.
Not a spell i'd recommend on Yi. Teleport is better suited for tanks in my opinion.
Also a spell that should go on tanks or a support.
Not a bad summoner spell. But not one i'd recommend.
Does not go well with Master Yi.
Not a spell i'd recommend as you should be smart with your mana anyway.
Very little damage and a waste of a summoner spell.

I max my Alpha Strike first mainly for early game harrassment. It is also a great farming ability. There is really not much else you can do early on anyway than Alpha strike for damage input. After that I max Wuju style . Midgame, when your gonna be starting to dominate the enemy, is when Wuju Style shines. As for Meditate , it is good for healing up before a teamfight or for healing at the last moment. Highlander should always be leveled when available.

.

After you get your Stark's Fervor , you should be set for domination. The attack speed + your ult = rape. But you will still be extremely vulnerable. So i would advise not engaging into risky fights until you get a Phantom dancer and a BF sword After that, feel free to gank any enemy squishys. When you complete your Youmuu's ghostblade , you're gonna be unstoppable. If a teamfight fails or a gank backfires, you'll have the Youmuu's active as a backup. If you're figting a tough opponent, the active on Youmuu's + your ult should tear him apart.

In my opinion, timing is everything when it comes to yi. If you dont go in at that right moment, as a carry, you will get focused. When you find that perfect moment to go in though, you might just get a pentakill.