Hi, I have not heard of it but I have worked my bike to the point were it can keep up to a CRF250 04 model with ease and it doesnt bog. You might think im exagerating, but im not as I have nothing to prove to you. You are correct in saying that the carbys are oversized. To help you with your problem, put on a straight through muffler or (an XR muffler as im told they are less restrictive) and you will see a few more horses and the bike will not get bogged down as much. This will be a big help but not a complete solution unless you put smaller carbies on or if you are mechanically minded, you can adjust the way the mechanical linkage system opens up the secondary carbie. Cheers John