Since we have such knowledgable experts on this list, I thought I'd dip into the fountain of wisdom once more. I think I finally figured out the right question to ask. I've posted a couple of questions on this list before and appreciate the great advice I've received on the subject of, you guessed it, JETTING. I bought my 99 WR400, used, in January and I just realized this week that it has been deoctopussed. (I never saw the octopus, or should I say, "air cut valve". It was like that when I bought it.) I have been experiencing the usual phenomenon of intermittent sputtering at constant speed with the throttle between 1/8 to 1/4. I ride mainly within 300 ft of sea level and avg temp is around 80° F. Here's what I now understand about my carb/exhaust setup: stock header, FMF Megamax II muffler, 11 plates, quiet core installed, 180-main, 45-PJ, #75-pilot air jet (PAJ) 1, DTM needle, clip in 4th position, #90-PAJ 2, #200-main air jet, no octopus and the air vent on the intake air horn has been plugged. The PAJ 2 has NOT been plugged. It had a 2" vacuum hose attached to it that was open to atmospheric pressure. That's where my bike seems to differ in carb configuration from others who have been deoctopussed. Last weekend, I took off the hose for the (cringe) first time and realized that the jet was clogged (not completely) with some mud. I cleaned it with some carb cleaner, blew it out and reinstalled it. I took it for a ride and it ran like crap! It seemed to be running way too lean, so through trial and error I adjusted the pilot screw to about 3 turns out and it ran great. It had a lot more power that I just about ever remember it. After I got home, I checked my manual thoroughly, took my carb apart, and figured out the whole octopus thing. I just finished installing the 48 PJ and reset the pilot screw back to 1-1/4 turns out. I also ordered a #100 PAJ 1 in anticipation of reconfiguring the carb to the settings I read about on the technical section of the owners forum. Now, here's my question: What's the problem leaving it like it is? Should I go ahead and plug the PAJ 2 and install the #100 PAJ 1? I did notice that dirt had gotten into the PAJ circuit through the open (PAJ 2) vent port. I cleaned it out, put a long vacuum hose on it and ran it through the bottom of the chassis like all the other carb hoses. I think that will fix the dirt problem. Do you think it will perform even better with the reconfigured carb, maybe solve the sputtering problem?