I just put on my HMF and now my bike revs fine until WOT then it kind of surges and hesitates kind of like a rev limiter. I had the DJ 142 in it with the stock exhaust and it ran just a little rich. I have went from 128 to 140 main jet with the HMF and I still have the same issue. I have a 2" intake snorkle. Any help would be appreciated.