When I had my '05 XR650L stock and lean, it popped like popcorn when I rolled off the throttle. (Near sea level elevation.) I uncorked it and changed to 55/158 jets (from 50/152 stock). When I did, the popping practically stopped. So does popping on throttle roll-off always indicate a lean condition? I'm asking because I should get my Supertrapp IDS2 slipon within a few days . If the popping returns with a vengeance, do you think I need to up the jets again? Maybe 55/162?