If i went down one tooth on the front sprocket on my kfx400, and put on a new hi rev cdi box, would i still have all of my top end speed? Also what is the company that makes the best sprockets?

 

Well, if you went down a tooth in the front then you'd get better acceleration but less top speed and vice versa, and in the rear it is the oppisite. As for your top speed question, you'd proly lose top speed even with the
high-rev box (because I dont think you wher hitting the stock limitter with the stock gearing). O' and Sidewineder has the best sprockets, I say.