I have heard great things from you guys about the 450 cam mod. I have found one from a guy that did the mod to his wr426 and did not run it but for 5 min. He had health problems and could not ride it. He said it ran great for that small amount of time but he and I were wondering about the differance between 450 cam gear and 00 yz426 timing chain and even though it would work (not perfectly) what were the effects of long term use? I ride hard and I cannot afford to replace engine. Help! What do I do??????? Thanks in advance!