I am going from 121" to 136" on my 01 600xc. My question is what else should I be doing when I have the rear skid out and track off? Any routine maintenance or things that should be checked while it is apart is what I am looking for. If there are things I can upgrade or change easily and inexpensively while it's out I might as well do so right? I am also thinking of dropping a tooth to give myself more off the line but not lose too much top end, thoughts on how many teeth and which one without needing to change chains? I am new to this and any advice would be appreciated. Also wondering what a boost bottle is/does and if it's worth it in your opinions. Thanks in advance for your help!