Here is the deal with my 07 wr450. It now has 06 or 07 YZ 450 forks on it which perform way better than the original wr forks. I weigh 170-175 in street clothes, and have just started off road racing the MRAN races in Nevada which include sand, rocks, pea gravel, boulders, silt, etc -- just about every kind of terrain except dirt or grass. The problem with this bike is when I let off the throttle or touch the brakes, the front end dives and knifes around and tries (sometimes successfully) to throw me off. If I tighten my compression clickers to keep the front end up in the stroke, it helps but at the cost of plushness. This bike is also hard to lean over in a turn at first, but then practically falls on it's side. It has stock 07 yz fork springs (.48s I believe) in the front and completely stock wr shock. According to the Race Tech spring calculator, the stock springs should work great for me. Sag is at 4". Does anyone have a good stack for a yz450 for offroad racing? I read on another thread that removing 2 31mm shims from the each fork and adding a 24 in the remaining 31s works well. I have not yet opened the forks to check the current shim stacks, but suspect they are stock.