How many sizes should I go up if I when I get a FMF Megamax2 pipe and a Uni/Twin Air filter. BTW what is the stock jetting??

 

Stock jetting can vary from dealer to dealer, more due to the general altitude of the region they are in.

I run from 4500' to over 10,000' and am running a 125. You will probably have to be ridher than that I would imagine.

The only real way to know is to run it and check the plug.

 

I live in NE Pa., and bought my quad locally brand new. My stock main was 122, with a DG RCM header/pipe and K&N filter I went up to a 125 and she runs great. With the right fuel mix your plug should be a brown color. Check your plug after a few minutes of hard riding. Good luck