I have tried various jetting combinations with DRR and EKN needles. MJ from 160 to 175, PJ from 38 to 45, clips 2-3-4. The bike has allways run well, no plug problems, easy starting. My only complaint with previous combinations is not enough jump off the bottom. I ride single track at about 500 feet. Most riding is second gear below 1/2 throttle. I ordered the leaner jets this week and just finished testing. I have been running EKN3 160MJ and 45PJ. Started today with 155MJ EKN4 38PJ PAS65. Ran better than ever. 4th gear WOT, let off the throttle and get one or two loud bangs. Turned out the PAS a little, the bangs went away but the acceleration down low was not as good. PAS to 60 and 35PJ. The acceleration down low is just awsome. Motor pitch is higher but it doesn't seem to lean. Motor is running hotter, I can feel it from the pipe. I still get one or two bangs letting off the throttle 4th gear WOT, and from idle if I wick the throttle it will stumple or stall. Would like to get rid of the bangs and the stumble. Can anyone bring me home on these issues. Other mods are in my signature. Thanks I just turned out the fuel screw a bit and the stumble went away. I also went to a 160MAJ today.