I just picked up a 1999 XR600R in SoCal for $1800 for my brother!! It runs good and starts good with the choke on. Once it warms up, it will cough and stall at idle if I am not carefull but will run fine as well with the choke off. I am assuming the previous owner might not have rejetted when he put on the pipe. I noticed it has more emissions stuff than my old 92 XR600. I went through the uncorking stuff on my 650, but I only had to change the jets on my 92. Is there anything special I have to do on the 99 such as an intake boot replacement (like on the 650)? What pilot and main should I run for about 2000 feet elevation? It has a supertrapp on a stock header. Thanks.