I just bought a 05 wr450 from a buddy. It has a Pro Moto Billet exhaust insert, the YZ throttle bolt, and the baffle has been removed. I'm assuming that from the factory it was jetted very lean to get it green stickered. Now that it is breathing better, as well as getting more air, I'm sure it is extremely lean. He rode it this way, is there any issues that may have occured already. Should I not ride it till it is rejetted? It has all the stock jetting settings currently with the AIS still installed and functioning properly.