Hi guys, I was hoping someone could shed some light a problem that I am having with my XR650R. I just purchased a 2002 XR650R from the previous/original owner and decided to do some routine maintenance (not knowing the history fully). I did the following: 1. Changed the oil (removed some metal shavings from the oil down pipe screen, which kinda worried me). 2. Changed the spark plug (the old one was more black then brown) It is much easier to start the bike now and it seems to idle fine. If I turn the throttle normally it revs up pretty good. However if I try and blip the throttle sometimes on the second or third blip it bogs down and dies. I am also hearing ‘popping’ sounds from the exhaust. I am thinking the bike is running either too lean or to rich, but has anyone seen something like this before? I would have thought the previous owner (single owner) had semi-decent jetting. It didn’t seem to be making the popping sounds in the exhaust before the spark plug and oil change. Hopefully I can figure this out and look at the valves tomorrow. I am in Canada, and was wondering if all the bikes up here came with the same jetting back in '02? Or do the dealerships tweak them before delivery (I am at approx. 3400 ft altitude). Thanks!