Help! I had a new topend put in, anyways, the guy from the shop calls and tells me the timing is way retarded and wants to know if I want to go to YZ timing. I go ahead and have him do it. I go to break it in and Bottom end is gone and I have lost 25mph off the topend. Middle is smooth. Does the sound right? Fyi, gearing is set to 15/36, all else is stock.