I have a 2007 KX125 Canadian model, which would be the same as the 2005 US model. I bought it used with low hours and a full Pro Circuit exhaust and VForce reed cage. The reeds are in good condition and I just did a fresh top end. Current jetting is 400 main, 35 pilot and needle clip on the 2nd groove. Using 91 octane, with synthetic oil mixed at 40:1. The bike has a terrible bog around 1/4 - 1/2 throttle. I am totally out of ideas. Any help?