I apologize for posting more on jetting. I've searched and cannot find what I'm looking for. This is the situation. I have a '98 400 with the following mods. YZ400 exhaust, YZ timed, airbox lid removed, de-octupussed, taffy mod, grey wire cut. I used Clark's de-octupus guidelines: DVP #4 needle, 180 Main, 48 pilot, 65 start jet, and Pilot Air 100. I live in a pretty low area in Minnesota. The problem is after the taffy mod (which seemed to work really well for eliminating the throttle snap bog) and the de-octopus mod, the bike really loses all power from about 1/4 to 1/2 throttle. The bog from the Pump is gone (thanks Taffy) it really pulls quick but loses all its power in the mid-range, then it picks up again and starts spinning the tires once I'm through teh midrange. I replaced a #82 starter jet with a #65. In clark's memo he says the stock is a 60. Did I grab the wrong one or would that even matter? I played with the fuel screw and the idle but that didn't make a difference. I can get it to idle but the bog will not come out. Should I put the old needle back in (obdt) or should I lower the clip on the DVP? I'm really confused. It didn't really make any sense to me when I found a #82 starter jet when I expected to find a #60 (left side of the Main Jet).