When putting a lets say -1 sproket in the front and I beleive 2 in back I have some questions below.

-What was your Rpm at 70-75mph? Did it raise a good bit from stock?
-Did your bike like to run warmer if it has much high rpms?
-Gas mileage did that go down a ton?

Anything else add like brand and what to get.

 

Well,

I have the "520 converstion you are talking about on all 3 of my race bikes.

In short, that -1+2 will give u low end torque, mid will increase as well, the top end speed will go down,

gas.... i dont know, are you buying the bike for gas mileage? i dont, so i couldnt tell you

Warmer, it should barely, you wont notice anything though unless you have your turkey baister out there lol...

not to be rude, but what are you trying to go for with the 520?

I have vortex sprockets on with AFAM chain

Renthal on others