I have a 2007 YZ450F that I just installed a CP 13.5 piston in. I broke it in before the weekend and then raced on Sunday. It was running fine for the most part other than this idle problem. I set the idle, then crack the throttle and it returns to the normal idle. However, when I put it in gear and crack the throttle, the bike will idle high until I either crack the throttle again with the clutch pulled in or put the bike in neutral. I also am using VP u4.4 if that matters. Bike seems jetted just fine while I was racing, slight decel pop when entering corners, etc. Any ideas?