My 98WR 400 has the stock jetting. It has the stock muffler with a Vortec tube installed, airbox lid off, I have not de-octopussed but did put a P38 and a Power Now Valve on. Currently the bike seems to run good and I'm having a great time in the tight twisting trails of Chadwick Missouri. So whats the problem you ask? The problem is I was rummaging through my tool box and found a OBELN - EP Standard Needle jet still in the little Yamaha Factory parts bag, which I purchased long ago and forgot about. The problem is I have an Engineering degree and like most Engineers I believe all mechanical things fall into one of two catagories: 1. Things that need to be fixed. and 2. Things that will need to be fixed after I've had a few minutes to play with them. Should I step away from the carburator or put the OBELN Needle in? Does anyone else run this setup? If so what clip would I want to put it on and would a new main jet/ pilot jet be in order. Would the performance gains be worth the risk of getting tangled up in a potential tail chasing exercise? Any thoughts from you carb experts?