I have read many pages on here and many people talk about flywheel weights. Some are using 4oz others 7oz and 9oz. What is the benifit of adding a weight that weighs more. I have a 03 450. What weight do you add? I assume that depending on what type of riding you do is linked to what size flywheel weight you would use. I only use my yz for hillclimbing. Any help in understanding would be great. Thanks!