This is my first post on thumper talk. I just got a great deal on a 4 speed 03' yz450f. I mostly do trail riding which I know the 4sp is not ideal for. With that being said, I know I can change sprocket size's and possibly the flywheel as well. I basically am looking for advice, suggestions and feedback from people who have ran into this situation before and what adjustments were made. Thanks in advance for your reply.