Hello Everyone, I have a recently purchased '99 YZ400F, and have a few questions: 1. My YZ400F that is great for most riding, but is geared too high for some of the tighter wooded trails in my area. I have to slip the clutch more than I'd like, and am worried that I'll burn it out. I'm thinking that maybe I should change the final drive gearing, which I have verified is stock. Does anyone have suggestions regarding a good ratio? What chain length will I need with the change? Will I have to change the chain rollers/guides? Thanks!