As you can see from my signature I ride a DRZ400 but I'm helping a buddy out with his 1991 XR600. It is bone stock and lethargic. Since he is not technical I told him I'd open the airbox up, add a pipe and re-jet it for him. I have the White Brothers Pro-Meg pipe picked out and I was wondering if anyone here has the jetting recipe that will work best for riding at 0'-4500'. I searched the archives but couldn't find a combo for this pipe and altitude. Thanks for your help.