I have a 2009 DRZ400sm with a MRD/SSW exhaust,3x3, and just installed the fcr39mx kit from TT. I did the o-ring mod aswell. I did forget to order the extended fuel screw so that wont be here until sometime next week. The carb swap was a breeze and the bike started right up. I followed the directions for the initial tunning. After my first ride I noticed a slight bog with the initial take off with light throttle. I also noticed on decel the popping from the exhaust was bad. So I took it apart again(really wish i had the extended screw at this point) and from the mixture screw being 2 turns i turn it out to almost 3 turns. The bog got alittle better and so did the popping on decel but both are still there. I know some popping is normal but this is more then I had with the stock carb w/JD kit. I did not have the bog as well. I know this is a sign of being on the lean side. Just wanted some help on what to change or adjust to help smooth it out. The WOT does feel great and is a big inprovement over the stock jetted carb. But I know there is more in the set up and with alittle help I can get the most out of it. I am at sea level btw. Thanks in advance for any help!