Watch the cost of the build. Ive seen too many late game builds, and though they are effective, they are way to expensive. It nice, but I suggest finding some cheaper items that will get you the same results.

I would suggest ArP Marks and Quints with Crit dmg Seals and Glyphs. You say you are lvl 14, so I would suggest that you start saving your IP for Tier 3 Runes once you hit 20. Look at a few of the Yi builds on here and see if there is anything that you like.

Hmm, thanks for the help man. I am fairly new, only level 14 so the runes are hard for me to predict what i will do. I will definitely swap the runes, and ill also swap the second PD for something like infinity, or maybe something else

Your second PD should not be :)

Yi AS cap is at 110% from items if i remember well, and this cap is reached with Zerks + malady + PD. Your AS runes and your second PD overcap you, and you lose some other stats here :) Runes should be changed for Armor Penetration and if you want some crit chances, you should make an Infinity Edge instead of the second PD.

Remember you'll have your ulti all the time if you use it well, so you don't need to get over 110% when it's not active.